 So guys what we were talking about is directly fitting on the definition, definition has to be always written in two parts, the statement of the definition, the score of the definition clear and followed by a unit if there is a unit and mostly when we talk about in electricity the term okay which are to be defined what is current what is electric potential right what is resistance and all these things will have to please mention their units and also if there is a minor metal formula to write it please. So the whole game what I was speaking about like or discussing about from yesterday's class So your voice is extremely feeble, it's hard to hear you. Very nervous here. Yeah your voice is appearing to be muffled a bit. Is it fine now? I think you have to remove that, are you using the MacBooks, this thing, mic? Okay I'll remove the mic. Is it better D.A.? Much better. Much better. Sure, I'll not use the headphone then. Sure, fine, fine, good, good, thank you very much keep, keep, keep discussing these things and all, sure, fine. So now when we talk about the representation, yes again the same story got interruption that yesterday people were literally solving quick and it was really impressive to see that you guys were really solving quickly, very quickly the equations, the quadratic equation were telling about their solutions and all but that is what he hates or will never even consider. They are on the way you represent your knowledge and at times it might happen that someone who actually knows the concept better, what people to represent will not get as much marks as he or she can consider that he or she deserves because the scoring turn on the basis of the way you represent your thought. I lost half mark in definition of dispersion of light because I wrote white light into instead of a spin. See, right? And this is, please do use the respective energies, the keywords, the primary thing because a definition has to be presented as definition. So yes, surely as we talk about there are questions in this chapter, one is definition, direct definition based questions, then comes the second one, then comes the second type of questions, okay, which are numerical, oblique, gullible questions, looking your sample papers, where your voice is, again, so now it is proper, one, two, seventeen, right? Sir, I lost half mark in definition of light because I wrote white light breaks instead of splits. Now it's fine, right? Everyone, good. So whenever it happens, please let me know, I don't know why it is happening. I'm not using the headphone now, okay, so I have completely removed it, okay, so good. So now, then you may have a graphical representation, which is star mark in this chapter, there is eye graph, okay, you may also expect, you may also expect, you may also expect, I got the reason of why it was getting faible, now it won't get, because I had kept my cell phone through which I am reading your chats, okay, very next to the microphone of my PC, okay, and that is where it was dispersing with each other. So now, again, V into I, V I curve, which is derived from Ohm's law, sure, and there is a minority of resistance being related to length or a possibility, clear? This is major, which you are going to get, okay? Then the third type of question, which is not exactly a numerical question, but varying the vary type, like you have two primary formulae over here or rather three, V is equals to IA, R is equals to rho L by A, and P in three different variations. So they might ask a reasonable variation that if length is doubled, will happen to the net resistance, right, and all those things, good. Now we are heading toward these topics, quickly we'll cover and talk about them, and I hope that you might be feeling comfortable in order to ask your doubts, because I know almost everyone in this room understand and knows what these talk, right, so you know what is electric current, and a circuit is primarily represented as a logic in the paper, right? So an electric current is the rate of mathematically, clear? At times it is also denoted by a small I, in your book it is denoted by capital I, so please follow that, simple, clear? Then we are moving toward, clear? Then we are moving toward the second statement, how a circuit is, so a circuit will have a certain components, okay? When we elevate the level of knowledge we may ask about or we may discuss a passive device, an active device and all, we are not going to discuss about that because we are concentrating only on 10th grade board exams, clear? So, when we talk about a circuit there are logic symbols, bulb, cell, battery, rheostate, so no, clear? At time rheostate or variable basis, clear? So be comfortable with these kind of devices, okay, and their representation because it is seen in previous year that a question came like, I will tell you that question type, okay, draw a circuit comprising of three resistors, two, four, x, okay, such that two and four are in series in parallel connected with six, so you have to understand this language and draw two, four and six, clear or not? This is exactly connected across a battery of some random 12 volts, say for example, is literally a question in previous year papers, so don't be worried on that line, clear? If you all remember all these logic symbols, you will get it, clear? So, talking about the next one, electric potential and potential difference, okay, potential and potential difference are very important when the definition is asked, what is electric potential? So, this is the only complicated definition in this chapter, the work done on a unit positive in order from, in order to move it from infinity to a given point, got it? So, it is heavy, the unit is a volt, okay, so in terms of electrostatic potential energy, V is equals to U by Q, all is equals to Q into V, important every time in alternate years there has been a question from this concept, okay, what they generally do, they at times also involve Q is equals to N E with it and ask at times, okay, but mostly there has been a direct question from U is equals to Q into V, where U is the electrostatic potential energy, Q is charge and V is the potential, clear or not? Everyone, G, I forgot it, a very good show, then we talk about, then we talk about, potential difference, so the difference in potential, okay, between two points is the potential difference, this is the major responsible factor for all, I will rather use the only responsible factor, okay, for charge to move, clear, yes or no, right, unit as it is the difference of potential, so the unit is going to be volts only, we call voltage as N D for no doubt, D capital D for doubt, good, Surya, sir, electric potential is V and PD is delta V, it is denoted by delta V, delta stands for difference in potential, okay, no doubt, good, very, very good, very good, very good, circuit diagram we have already discussed about, so I will skip to the electric potential Navya, okay dear, don't worry, here is the nodes and all which is getting saved, electric potential is the work done on a unit positive charge in order to move it, okay, so in order to move it from infinity to a particular point, okay, by this we are defining the potential at that point, got it, Navya, very good, next one, circuit diagram as I stated and then come uncle Ohm's law, right or not, uncle Ohm thought about this and he stated, yeah, see it is the V who is causing charge to move and by the movement of charge I is coming, so right or not, V increases, so do I increases, oh they are directly proportional, I don't want to put proportionality or I want to put equality, so I'll have to put some constant but is R actually a constant, quickly respond over the child, a Y for yes and for no, is R actually a constant, Aniket Gupta and Prishim V, Surya and alternate, okay, two Surya again, Akshidaya NNN, oh it is a Y, Siddharth, Y it is a constant, R is a constant at a given temperature, R in, then how do I have one Ohm, two Ohm, 15 Ohm at the same temperature in a single room, in a single box, yeah, so Prishim this is the part which everyone misses while writing Ohm's law, for a given temperature and pressure is okay, okay, one part, for a given conductor, for a given conductor, for a given temperature and pressure R will be constant, most of the, most of the, like last year we have been conducting mock tests, right, we have seen some copies and before that came on used to happen as theory exam as well, right, so it is seen in many cases guys, you don't write Ohm's law with a statement that for a given conductor under same physical condition, the current is directly proportional to the voltage applied, got it, sure, for a given conductor is a very, very important line in that, Aditya, you are noting it right, okay, okay, I'll repeat that and also guys, remember, after every class you will receive a PDF, okay, sure, you are receiving the video, so you will receive a PDF as well, where you can easily read about all these points to ponder things, I'll repeat, Aditya, that for a given conductor under similar physical conditions, the current is directly proportional to the voltage applied, got it, akshita bachaya, the video will be shared at the same, everything, every simple chotu thing will be there in the same location, the sentem.learnest.com comprehensive revision program for 10th grade 2020 to 1, got it, very good, sure, so uncle Ohm came up with this logic and he made some good 3, 4 marker question for your exam, right or not, sure, the same funda can be applied, sure, for numericals, for graph based question and for both, varying the variable type question, okay, all three and anyway Ohm's law can also be asked as it is, got it, sure, the current is directly proportional to the voltage applied, okay, Varsha, very good, very good, very good, very good, very good, very good, very good, so, so uncle Ohm stated it and based on it, you will have numericals as well, then moving slightly forward, you have this very important line, the definition of R, uncle Ohm stated that R is a constant for a given conductor under similar physical conditions, so what makes R to vary, R is dependent on primarily three factors, row L by A, where a row does not stands for density, then what is stands for, typed, irresistivity, good, last year in 9th grade you have seen a row somewhere, which chapter was it, though this year it is filtered out, which chapter was it, where you have witnessed row, the text book says I is proportional to V and thus we can write V is directly proportional to R, why can't we write I is equals to V R, okay, let me read it again, the text book says I is proportional to V Ohm's law, okay, for a given conductor, thus we can write V is directly proportional to R, beta, so for that I have to talk in the terms of mathematics with you, understand, okay, by on C, our committee's principle is correct, density of things and all, no, no, no, because we will have to talk the science, okay, Aniket is helping you out to understand that, see, Varsha, Varsha and Akshita, Akshita, Akshita bache, there is a way in which mathematical statements are written, so you have got confused, okay, got it, we can comprehensively talk about because if we go in that line, we might invest our time in a non-defined direction, right, Akshita, is it okay? Good, thank you, thank you, thank you, thank you, here row is resistivity, important term as far as the definition-based questions are concerned, very, very important formula as far as the varying the variable type of questions are concerned, very, very important, this is the portion of this chapter where I guess if only one question has to come for varying the variable, it will be from this formula, R is equal to row L by A, okay, got it guys, row stands for resistivity, resistivity, okay, what is the unit of row, you know, ohm meter, clear, sure, no doubt in that, fine, row can vary or not, yes, row can vary provided the physical condition of the material or the material are changed, got it, yes or no, everyone, should I repeat anything, everyone's dead, good, good, here the questions which comes on the line of varying the variable are of two types, one, cutting a wire or joining, type number two, compressing or elongating stretching a wire, sure, if you guys know and if you remember, when you join or you cut area remains same, whereas when you elongate or compress L and A will change hand in hand, yes or no, got it, very good, so very good, very good, 9th grade you have these kind of numericals in mathematics, right, volume remains same, what about double of itself, Aditya that is twisting a wire, turning a wire, that's a different case, okay Navya, our resistance is dependent on three terms, okay, three factors, the material that is the resistivity of the material, second, the length of the wire, third, the cross sectional area or the thickness of the wire, is it possible to compress it to such an extent that it becomes more dense and the volume reduces, Aniket, while doing so we are considering that we are not bringing any molecular changes, okay Aniket, sure and we are performing them under similar temperature, so even liquefaction or the other is also not included, very good, very good, imagination is good, clear, good, now talking about the other line, sure, these questions as I stated will be on the basis of cutting or joining or compressing or elongating, clear, sure, very good, it is also seen in recent papers under the section of HOTS higher order thinking skills that questions on resistance were based on circular calculations, like simple, a wire of five ohm, okay, a wire of five ohms resistance is turned into a circle, clear, sure, a 60 degree arc is taken out of that circular construction, clear, what will be the resistance of the 60 degree, so your answer is pretty okay 60 degree out of 360 into 5, but see writing this in paper is very important, you can't just write it like that, sure, everyone especially Aniket Gupta, yes or no, you have to write it, you know it, right, you will look at the question, you will laugh at yourself, you will write the answer, this is not to be done, okay, you have to systematically write the approach, you have to mention things, their points and then process, clear, everyone, I am not just in physics or in mathematics, okay, even in chemistry and biology, generally these are not discussed in chemistry and biology because their concepts are theoretical, so anyway you have to write English, okay, in physics and mathematics at times you go just with the flow and answer and all, right, don't do that, please, so most of you lose the marks in physics and mathematics, primarily being good at it is because you were too fast in writing the answer, clear, so you will have enough time in the paper, please, please, please invest that time on properly representing the answer and solution, okay, everyone, sure, good, good, so I don't want to bore you much, okay, what I will do is I will first go to some questions, we will come back, is it fine, because I guess I will kill you if I will keep on discussing the theory and all, is it, okay, I will discuss two, three, four points and then we will proceed, I did not want to bore you, yeah, I understand even I am similar to you, I just hate theory, why are you talking, question it, right, but we can't do that, which we have to invest our time in representing the things because the board, the design and it has its own importance, no one can say that's bullshit or other things, I don't want to speak out, right, okay, you know that, okay, you cannot state that it's of no utility, you can go to MCQ and all those types, no, you have to have those representation habits being generated in your age group, because that is what is going to help you in the flow of life, doing things systematically has its own taste, has its own importance, okay, quickly, resistance of a system of registers, so primarily you have series type of connection and parallel type of connection in the series type of connection, in the series type of connection, the equivalent, yes or no, do not use the word total resistance, nah, equivalent resistance, importance, again the same thing, splits and divides, yes or no, you will remember it for life, who checked your copy, don't mention the name, school teacher or what, literally excellent, she just got the exact point, so our equivalent, not our total, neither our net, nothing, our total doesn't even exist, our equivalent, equivalent resistance importance, but it's a word, like it's the difference of the way they are stated, is the difference of terminology, is the difference of the defined term, clear, like it happens, writing prohibited and writing not allowed have different impacts, no, equivalent, effective resistance is a common word, it's not an IUPAC word, you know that IUPAC doesn't participate here, I'm just telling you to make you understand the importance, clear, clear, no, no effective, nothing, our equivalent, why are you so lazy and thinking and investing your energy in order to find a different word for a given word, equivalent is not like flabbergasted or unfathomable, right, equivalent is okay, sure, good, so when you guys can use words like that, what is the problem with the simple chotu word equivalent, so our equivalent in the case of series is the sum of all the connected resistances, whereas our equivalent in the case of parallel, please, please, please here, I have this habit of writing it this way, because you guys have generated that, always people write it this way, they calculate for two and three and whatever and they forget to reciprocate in the last step, that's why it is okay to write this, so our equivalent is equals to the sum of the individual reciprocals, finally reciprocated, got it, better that is one by our equivalent is the summation of one by rn, our equivalent is the inverse of summation of one by rn, clear, Aniket, good, very good, so don't make this mistake, see you can, this and this are correct, okay, but just do not make that mistake of leaving one by two as one by two, the answer is two, you know what kind of question I am talking about, yes or no, sure, very good, next, heating effects of electric current i square r, yes or no, what are the formula of a heat coming out of a resistance, quickly over the chat, you can type square as just a two beside the factor, very good, very good, very good, very good, t is very important, guys do not forget it, i square rt is the formula of heat, heat is an energy, this term is just a power, power into time is energy or rate of doing work, rate of the energy flow is called power, you guys literally at times forget that t and just mess up, don't do that, clear, good, quickly moving forward guys, electric power is available to us in three varied formats, yes or no, p is equals to v into i, v square by r and i square into r, am I right, n d for no doubt, d for doubt, very good, relax, may God bless us that we will quickly finish these cards and proceed to a new format questions, quickly read, and I would be happy if you guys will answer, okay, if you want time to respond, send me t, if you want me to solve and discuss, send me m, t or m, quickly over the chat, good, good, good, good, let's go, two unequal resistances are connected in parallel, congratulations to the resistances, if you are not provided with any other parameters, example numerical value of current and resistance, what can be stated about the voltage drop across the two resistances, so by principle the voltage gets equally distributed, you have to write it across parallel, I am lazy, why I'll write this across parallel resistors, hence the voltage across them will be equal, okay, so please, please, please invest time, please invest time in writing the answer, the primary thing is this, in mathematics guys you will do the theorems, there will be no proof of theorems and all, are they still like in the design of the paper, in mathematics, prove the basic proportionality theorem, BPT, Thales theorem, area proportionality theorem, right, circle and tangent theorem, all these things are there, so good, very good, now, so what do we say about the heat, so is it directly or inversely proportional to the resistance, repeat the line, so heat is directly or inversely proportional to the resistance, very good question, so in general as we say, if across a battery a resistor is connected, right or not, so people will say, heat is V square by RT, wrong, heat is I square R into T only, okay, don't confuse yourself with this line, heat is I square RT, got it sir, so if we have a question that there are five balls connected in parallel or series, so which connection will produce more heat, very good, very good, very good, five balls connected in parallel or, sir, which of the two formations will, so suppose two, let's replace five by two, okay, sure, so there will be ratings on the world bache, suppose this is the rating, yes or no, a series connection of the same and a parallel connection of the same, okay, in series with, you understood what have I done, yes sir, suppose the supply is 200 volts in both the cases, right or no, sure, now the question is, which circuit will generate more this circuit, will it generate more heat, please answer, sir, it should be parallel circuit, right, this is a and this is b, a or b in order to chat, people are saying parallel circuit, okay, a, a, a, a, a, a, a, a, a, a, a, a, a, good, why, why, why, come with a why, CBC you cannot write just a, you have to write a why, why, why will it happen, sir, my logic was that because the resistances are connected in parallel, so the current increases and so does the heat, very good, what she is saying, sir, see, out of this some current will go, suppose I1 here and I2 here, surely I1 is not equal to I2, because R1 that net R or equivalent R, equivalent R, right or not, the equivalent resistance of this is lesser than, parallel is less than R equivalent of series, right, and hence in this connection the heat will be generated, so heat of parallel rather, right, heat of parallel is greater than heat of series, now the same confusion still stands, the girl asks, sir, heat is directly proportional to the resistance or inversely proportional to the resistance, yes or no, sure, so bache, here is a difference, may I, yes sir, good, sure, here what you are saying is the power delivered, the power delivered bache, the power delivered is greater than, in parallel is greater than the power delivered in series, the power utilized by the combination is greater, okay, now what is the difference between power and heat, yes or no, clear, what this implies that heat is inversely proportional in this case, that is what I am, that is what I am explaining, are you relaxed, okay, surely power and resistances are inversely proportional, no confusion in that, yes or no, no confusion in C, clear, and power and resistance are calculated over the rated signs, okay, please never confuse always, if I have to calculate the resistance of this bulb, I will do 100 square by 60, yes or no, everyone, yes or no, no doubt, good, not here, here you cannot state that the dependability of heat is on R because in both the cases this I is also different, got it? So, what is going to be the answer? In case of constant current, that's what, again the same thing what Akshita initially asked, we can also write I is equal to V into R as well, okay, same thing, for same current in same time higher resistance will utilize, yes or no, higher power or deliver higher heat, got it? Whereas for constant voltage, clear, in same time the lower resistance will utilize the higher heat, got it or not, what was constant here in the given scenario? Sir, no, could you repeat the last part? Repeat? Yeah, the last part. Should I repeat? Yes, sir, yes, sir. Good, but you see, when you guys will grow up, okay, understand, okay, that is the next year only you will grow up, every day we grow up but next year you will read about or you might have in chemistry read about this equation called as PV equal to NRT, yes or no? Have you seen or not? And for no, only those who have not seen respond N over the, no, very good Aryan, relax, very good, okay, so understand, but when there are multiple variables varying the variable concept is there, when there are multiple variables involved in an expression, okay, the dependability of one is actually dependent on multiple, so while actually calculating the relation you keep at least the remaining things constant, so when we are talking about the dependability of power or heat on resistance, we have to state that for a given current and given time the higher resistance will utilize higher heat, okay, will utilize more or deliver more heat, got it? When voltage is constant, power is inversely, heat is inversely proportional to R, whereas when current is constant, heat is directly proportional to R and that is decided by the design of a circuit, easy. Sir, but if there's just one question, like is heat directly or inversely proportional to resistance, then what do we write? Like, suppose there's an MCQ, MCQ will not come with partial information in a case like this, okay, even they know, so you will have to write, they will write because I have seen those, we in NTSC class and all we have done, those kinds of MCQs, no? They write in a series circuit, two registers are connected, 160 ohm, 100 ohm, which one will deliver more heat, so you know in a series circuit implies that the current is constant, got it? No sir, we had a general question that just said, it didn't mention that whether I is constant. Okay, I state the question. So it was five bulbs, I texted you personally also, so I've sent it to you, five bulbs. I look at it, don't okay, no problem, that can be comprehensively discussed but I guess, is it now clear, you will remember for life that under given conditions, like condition number one, if current is constant, then in equal time, the resistance with higher value will deliver more heat. If voltage is constant, then in equal time, the resistance with lower value will deliver more, got it? Sir, why is I square R taken as Jou's law then? That's what, see, but why it is stated, when you design a heating device, okay, it works, so I square R. So see, I repeat, understand, heat is primarily by default, heat has to be considered I square RT, okay? Under varying conditions, there is a possibility, shortly, seriously for your standard will not go to that depth, for you, if I wanted to just close that file, I would have stated that always remember I square RT is the default formula for heat and all that, but I'm explaining because I have to invest time with your concepts as well, please remember I'm repeating that line, the heat delivered under condition one, given current is directly proportional to R, under given voltage is directly inversely proportional to R, got it? Okay Navya, we'll first after the class discuss about your assessing the awareness and second, I'll also personally share with you the notes, don't worry, clear? P for proceeding, next question, some work is done to move a charge queue from infinity to a point A in spacer, are you trying to create an analogy between equations of constraint when considering the ideal gas law and constant that appears when constraining circuits? Yes Isha, I was explaining that when there are multiple variables in a equation, then the relativity of one with the other is defined keeping the remaining constant, okay Isha? Very good, very good. So some work is done, work is done means what will strike in your mind is potential, right or not? See guys, actually the way of solving questions is simple, when you read a question the very first line say for example, this is an example, okay when you read a question the very first line tells you about its chapter, yes or no? Clear? The first and second line mutually will tell you about this topic, as soon as you recognize it a toolbox should open in your mind, this is always there in this topic, these are the formulae, these are the definitions and all, reading the second or third whichever is the question based line, you will be able to tell out of the given or available tools, this is what I have to apply, reflect in the paper properly and get the answer as my dear friends here have already stated that work done will bring change into potential energy, which is equal to Q into V, V is capital, sorry, okay. So the question is some work is done to move a charge capital Q from infinity to a point A in space, the potential energy of the point A is given as V, what is the work done to move this charge from infinity in terms of Q and V and you know the answer is clear capital Q into capital V, no doubt ND, sure. See this year it's an estimation though a lot straight concept-based questions, the reason being officially though by CBSC no delivery has been made because I understand guys CBSC is not just thinking about champs who are sitting in Indra Nagar, Bangalore type locations okay or Yashwantpur and all throughout Bangalore I'm stating okay, they have to also think parallely about people sitting in Rameshwaram, people sitting in places like Himalayan ranges, people sitting in places like Assam, Gujarat and all those very very peripheral areas where online education is not yet a very clear line, sure, clear okay. So please be thorough with the fundamental concepts, they are going to help you out on a very high scale moving on to the next question okay, numerical, don't be very happy and respond quickly read, strategize how will you write and then respond, strategize how your response will go and then respond, a student has two registers, two ohm and three ohm congratulations to the student he got or she got at least these precise values, she has okay she has to put one of them in place of R2 okay congratulations, the current that she needs in the entire circuit is exactly 9 ampere, show by calculation which of the registers she should choose, my answer I guess you guys are late, three ohm then sorry two ohm, when three Satyajit then someone two two okay finally two congratulations and see Satyajit, Prasim, Akshita, Adet, Surya, Aniruddh everyone ohm please two ohm three ohm at least write ohm yeah people do you know like people do jobs of ohm 108 times 108 times you have to write some very few times ohm yeah write that ohm right back to agenda right so so everyone got it surely there is a parallel connection of R1 and R2 so you have to state like that the circuit comprises of R1 and R2 under parallel connection sure so the equivalent resistance of R1 and R2 so should be equal to applied voltage by required current am I clear as per the parallel combination R equivalent will be equal to R1 R2 upon R1 plus R2 which is 12 by 9 solving you will get the answer everyone yes or no sure ND for no doubt please please please mention the answer and highlight it yesterday Tushar Bhai was speaking and stating to you guys right that please do not create hurdles or obstructions in the flow of the examiner while he or she is checking the copy keep things simple for them to understand the answer is done by the concept enlisted and here is the final answer sure they should see very clearly the steps and the concept I involved in the solution sure I know in general we would have rushed through this question just in seconds I'm sorry but yeah I have to bore you for repeating things for a number of times but because that is the thing okay that is the thing please understand that is the thing we are trying to do through all this this whole comprehensive revision program your response and the method to respond should get amplified in a positive sense short teacher told us answer statement carries half to one marks yes aren't I'll tell you which aren't if I would have been an examiner my first approach post look into a question would directly go as a human to the highlighted answer I'll match the highlighted answer with my answer key both match prejudice that the solution is correct just for formality I'll give a top view okay hold us a rush through through what you have written here clear we'll find our equivalent key marks straight given happy you and me yes or no got it primary view of any examiner goes on the answer if you have highlighted the answer very clearly so please please please do that because that gives a very first idea I guess this should be a human exercise okay and I haven't seen aliens checking your copy so got it guys everyone good those who have by any chance seen the sample paper know these questions I am not disturbing you our arms take your time read it strategize the flow of your solution especially in point based question you can see 0.1 0.2 0.3 0.4 your method of solution will follow that okay Surya no problem answer number one they are connected in parallel good answer number two what are the advantages of parallel circuit when anyone else sorted the circle does not break and the circumference is continuously supplied to the other appliances good very good good come relaxed understood very good so second question is indirectly asking you the to highlight the benefits of parallel circuiting why and domestic electrification parallel circuiting is used okay good very good very good very good so explain with proper calculation which lamp glows the brightest so you have to give the output for all okay then comes good find out the total resistance of the circuit find out the three valent resistance for ohm very good very good very good I don't know whether your answer is right or wrong but ohm is what for which I am stating very good very good very good okay actually at this point of time any dear friend of mine at this point of time any dear friend of mine if you have got doubt in the part one two three or four please feel free to ask please please come up with your doubt which anyone good relax no problem very sure so guys the things are quite good and straight one two three and four third not getting it aren't very good very good very good I didn't take okay but this is parallel combination but a and a power output can be written as V into I yes or no yes or no arian yes but V through all is same sat 60 60 60 60 so V is constant so the one with the higher I will deliver higher power who is having the highest I arian the one with four ohms okay this is the fourth answer sorry good come on come on come on okay no problem this is not a silly mistake it's a sinful mistake are in the exam hall as we come out of that hall we'll be like hey god what have I done to the empire meh kya se mooh dikhaunga is zalim jamaani ko and all that fine I'll surely practice exercises will be there don't worry okay sure sure fine that's Bollywood yeah what people will do on 24th December Bollywood right yes or no by Avengers end game is done I am not having any expectations from this movies coming now that vision and that which red which what is the name of that girl huh yeah I'm not having any any expectation I was having some expectation from this um Black Widow movie okay but I don't know when it is coming and all okay that that we'll discuss Aiden after the class personally yeah exactly that's that's the scene and again let's go back to agenda guys someone asked why it is required to look at 60 volts that is the voltage in order to find the P output because beta for P you have to either know VR IR yes or no or VI here R can be calculated sure at least till question number three though we haven't calculated R yes or no so till three we can apply V into I got it end game would have been delayed then we would have a strike in like then a strike uh in front of WHO uh try to directly share with her the link your link can be fetched from the group okay good back to agenda guys third done find out the total or equivalent resistance of the circuit so yes for this though you need the R the R the R and the R clear and you have R is equals to V by I be happy in your life 20 ohm yes or no sure 15 ohm clear 12 ohm and again 20 ohm connected in parallel can you guys answer this you have answered that R equivalent is four ohms everyone yes or no good very good very good very good sure moving on to the next one here we go these all are see they call definition what is meant by electric current name and define its SI unit see third again okay relax aditya aditya which explains with proper calculation which lamp glows the brightest the lamp which delivers the highest power glows the brightest yes or no aditya power can be stated as V into I all balls have constant V 60 so the one with highest I will deliver the highest power clear okay this is the news I will do this now I will do this now it is okay good keep reminding me sure because I guess Tushar brother is also listening to lectures either he lost his attention no problem there were six people in there no problem so can we directly add up current and then divide by 60 rather than finding out R for each bulb can I shardly very good this is an NTSC weather good no doubt as expected understand in 10th grade current division rule is not taught to you yes or no current division is taught because it is not there in NCRT which is not there in NCRT at least so that is where I doubt that you can apply congratulations you can do that congratulations then you can no problem good good good there is no direct mention of it that's why we avoid it much okay very good very good very good next yes aditya sir I had it can we also use V square by R for the third one repeat one can we also use V square by R for the third one huh but for that you will have to calculate R and then for R you will do V by I oh yes I I used a different method I calculated R you are doing R is equals to V by I and then you are calculating P as V square by R can I instead of our right V by I so you are eventually doing V into I only yes or no yes sir yes got it very very relax so sir the exam point of view can we use the total thing if you guys are so confident about but I haven't read this topic directly in NCRT so I won't advocate that okay it won't take a long time in order to write R1 to R4 and then find one upon R1 to 1 by R4 and hold reciprocal right or not so why to take a risk okay yes good very good very good very good very good job P for proceeding to the next question and here is already there guys so yeah here again what is meant by electric current the rate of low of charge is called electric current name and define it SI unit it's defined it's SI unit is ampere now they are also expecting a definition of ampere what is the definition of ampere is a current in a conductor when one coulomb of charge passes through it in unit time very good show very good very good very good very good very good arian very good now in a conductor electrons are flowing from B to A this is a different question okay separate but in the same different segment in a conductor electrons are flowing from B to A electrons okay what is the direction of conventional current quickly answer is A to B right because conventional current goes in the direction opposite to the flow of electrons give justification for your answer that's what I stated because and all next part a study current of one ampere flows through a conductor congratulations to the conductor calculate the number of electrons that flow through any section of the conductor in one second so again nothing but the definition of one ampere is here clear this is 10 to the power minus 19 okay so everyone GI got it everyone good good good good good good good good good very good see aditya kumar annel wherever you aditya you got locked out by mistake or what i'm talking to aditya kumar annel don't worry come anyway guys moving on to the next question here it is what is meant by electrical resistivity of a material derive its SI unit so you cannot just write oh meter okay you will have to mention you cannot just write omometer you will have to mention no you have to calculate understand very good that resistivity can be written as r into a by l which is om into meter square by m so omometer got it this is expected aniket okay mojapada you will write that no shares the definition of resistivity is the property by virtue of which a material shows resistance is called its resistivity the words the virtue of which and all is important yeah it's the intrinsic property of a material by virtue of which it offers resistance to the flow of current very good this is the om you have to write at the top of the copy right she got a shy namaha people do that yes or no have you seen such copies i've seen no not not never i haven't done it no they might deduct because aniket see for all those copies with all these garnish things done in my school time when i have seen those those kind of copies they were always having single digits scoring char mark teen mark sat mark so there is no scope of any deduction you know yeah types three by forty two i have seen seven by forty i have seen chalo when it is eighteen it can be eleven and twelve type thing okay chalo good p for proceeding to the next one all right one second the spot is there describe an experiment to study the factor on which the resistance of a conducting wire depend so this experiment is given an ncrt book please read that learn it by heart it might be of use heart ncrt activity understand i'm repeating guys this year they are going to discuss with you things which are as it is in the book no suya you can answer that refer your own public publications chalo good next write two points of difference between electric energy and electric power their definitions their formula and their units clear yes prishabh very good talking about this question card 15 i write two points of difference between electric energy and electric power so again for any two terms where difference is asked the primary line is their definitions then if they have a mathematical formula and then their units they have only asked to you can ask any you can mention any two do not eliminate this this is a primary difference okay don't say gary a bar formula like this a bar you know don't do that so sir how to define electrical energy simple energy electrical energy is the calculation of power over a given not calculation delivery of power over a given duration of time is called the consumption of or delivery of electrical energy got it so okay but in mechanics power is the work done per unit time so here power will come out as the product of voltage applied to the current delivered depending on the resistance combination the current is delivered current is never supplied to a circuit right current is delivered so because they are not asking you to define energy and power they are asking you to define electric power that definition has to go different clear in an electric circuit the power is defined as the product of supplied voltage to the delivered current this current is okay energy is like in an electric circuit the electrical energy delivered or consumed is the multiplication of power delivered or consumed over a given period of time so both are mathematical definitions yeah actually if we would have been asking talking about electrostatic power and all there is a definition okay but that cannot be included electric power and all okay so good next one out of 60 watt and 40 watt lamps which one has higher electrical resistance so p is equals to v square by r and p and r are inversely proportional to each other so higher r will be associated with lower p 40 watt you have to mention v square by r okay without mentioning v square by r it won't be any fun okay important important kilo watt r convert beta designed see rated power see again same thing but at the time of rating when a design equipment is designed it will only have its expected power over applied voltage there is no existence of current until unless you connected with the circuit sure so for a designed part there is sense is included resistance is included in the existence of an appliance okay it is not just activated when it is utilized current is something which is activated when an appliance is utilized okay got it exactly current does not exist at when the device is just got ready okay good very good hey Ankur can you just make me a co-host for some time okay i'll make there are lots of people who had since six six six people yeah i just you know only one is showing at me no i made all of this basically many of them are getting disconnected okay okay in between they are getting disconnected okay just keep that participant you are co-host please okay okay guys sir what if heat generated by fuse is asked there we must use current as current rating is supplied yes but i see for fuse the designing is done basis on the current yes or no so there you have to mention depending on what resources you have been offered according to what is given that is stated very good okay very can we people proceed good next define one volt express it in terms of si units of well define one volt quickly define one volt so see initially if you read this question you might have this thing here v equal to ir can be utilized to define it but the next line is making you very clear that no bhaiya i want q into v yes or no clear sure so they want in the terms of work and charge one coulomb through a battery of three volts clear so the energy consumed will be equal to q into v three joules got it everyone everyone sure see it happens there are multiple formulae of v right two primarily not multiple even okay yes you can also state in p by i types okay but no when we talk about v we can think about i into r and u by q the second line is giving you a hint that u by q is what we are discussing yeah very one two and here we go to the next one yes a and b are of equal length congratulations to both a and b and have equal resistance if the resistivity of a is more than that of b which wire is thicker varying the variable there is a variation in the variable do we say the potential at a point is one volt or do we say potential difference between two point is one volt better potential difference is to be mentioned in the terms of voltage okay good because row was same for both so see you cannot just write it like that you have to state that given that r1 is equal to r2 r1 is row one l1 by a1 is equal to row two l2 by a2 as it is given that I do not show l is same and clear row one upon row two equal to a1 upon a2 so if the resistivity of a is more than that of b as row one is greater than row two implies that a1 will be greater than a2 so wire a will be thicker highlight the answer please all these kind of cases highlight the answer if you will highlight the job of the examiner will become more simple he will be more happy or she will be more happy life becomes easier they will be able to bless you with some good marks clear you put them into multiple overwriting and confusion make them read the line of time and again irritated even if your answer is right they'll say this is human tendency and no one has ever seen an alien checking your copies moving on to the next one everyone g i got it right relation between heat energy produced in a conductor when a potential difference of v is applied across its terminal and a current i flows through for t so now h is equals to v i t exactly now h is not i square r t good how it would be if an alien correct so your result will come in one day you will not get any summer vacation leisure so you want that kind of life no no one wants that life the time between examination and the day of result is coffee leisureless exactly that is the time we can enjoy because post-result of no one in nation enjoys right or not the top of that also thinks which college admission will get his tension post-result is when again headache starts exactly we are talking about superpowers why have to exactly alien can be more dumb right why we always consider them to be genius that's good but that so actually that in that case for them we uh were like that no in that case we have to assume that there is an equally comfortable earth or more comfortable earth exactly come back to agenda so we are done okay next question oh this is a good one a and l are varying read l by two okay this is l this is two l this is l by two this is a this is a by two this is two second my internet connection is unstable oh but it is being telecast since i can well have the highest okay good so anyway you will write r1 r2 and r3 right r1 is copper same material no confusion rows are same okay now l for one it's just l by a for second one it's two l by a by two so four row l by a and for the third one it is l by two and two a so one by four row l by yes or no sure so pretty obvious the highest one is second then the first and then the third clear very next question l is same where no but i have given you readings and l by two and look look at the other question good no problem and flowing through the following electric circuit three point six six one three right yes three so now anyway they have simplified the calculations three point six is in series with six four by six plus four which is further in series with three so you will write our equivalent is equals to three point six plus two point four plus three yes or no so which is a nine clear good then comes the current yes or no so current is equals to v by r so half ampere or no problem in writing 0.5 ampere okay good next relax and respond our arms you have to read if you'll not read case is difficult okay reading the question is primary thing but say board exams may please please to in any exam but in board exam please thoroughly as we have seen like in the earlier question okay they asked you to define v we thought it might go i into r but actually it went u by q sure so reading the question is very important calculate the resistance of one kilometer long copper wire of radius given but yeah this is not area this is radius please note that this is not area this is radius yes or no so it is completely a calculation based question you have to first calculate the area the area is pi square yes or no good is 10 to the power three meters don't write one kilometer write 10 to the power three meter you have a high probability of making a mistake by just leaving it like one okay the resistivity row is given 1.72 into 10 to the power minus eight clear oh meter units are important units are important 5.5 but it is suggested to please go at least to the same places of decimal as mentioned by any information in the question if there is an information with two places of decimal please go to two places of decimal okay sure so 5.5 might not be welcomed area okay two places prashayam 5.47 Bolo if it is correct indicate pi value 3.14 can be taken 22 by 7 can be taken as they are not mentioning anything about it good but the final answer is what i am talking about okay the final answer has to be given in the form of the least places of decimal as given through any information in the question until a list specified otherwise okay if they say go to only one place of decimal or three place that's secondary case but if not specified then you have to answer in the at least in the format of the least position given in the question as information okay 5.41 or 47 by there is a difference anyone with d for doubt capital D for doubt of how to do it so r is equals to 1.72 into 10 to the power minus 8 L 10 to the power minus 3 sorry plus 3 by a 22 by 7 into 10 to the power minus 6 5.55 by okay then it is up to you but please answer in ohm's mandatory to write units okay next draw a schematic diagram of a circuit see we were discussing about this draw the schematic diagram of a circuit please i am not expecting you guys to show me the answer post drawing here don't worry of a battery in ncrt one such system is called cell so please draw multiple systems to signify a battery okay so of four cells see of two volt each i'll have to draw four cells this is the scene i guess they might expect two volt into four is equals to eight volt okay there is no harm for them in expecting the bacha is a liquor and that is too lazy to draw just visualize a leakage you cannot afford to be lazy in cbsc board exam you can afford to be dumb but not lazy okay each connected to a key okay key brother and a meter and two resistors two and three respectively in series and a volt meter to measure potential difference of three oh yeah two ohm three ohm and a volt meter to measure yes or no clear sure they might extend the question by staying like stating that clear explain your connection sequence so you will have to at least explain why volt meter was connected in parallel and why a meter was connected in series why volt meter is connected in parallel quickly anyone only one point i know the other you know quickly because voltage high so in order to get the precise reading we have to get equal voltage okay the volt meter is very high if connected in series will alter the performance of the circuit hence clear short circuit new resistance the value but i mean the short circuit short circuit is when a meter is connected in parallel not voltage is connected in series okay long circuit yeah sure don't do these kind of jokes in cbsc and make a smiley smiley good question my 60 watt 240 volt okay calculated resistance so power is defined as v square by r under rated condition so resistance will be equal to v square by p you can easily solve and calculate relax don't worry next do not forget to write ohms here please yes good next calculate this resistance done if the voltage drops at 192 volt calculate the power consumed so now see the supplied voltage is not 240 it's rather 192 in that case you have to calculate power and that power can be calculated as 192 into 192 by r got it yes or no with a lot of English in between English is must there count it be the paper of mathematics or the paper of physics English is mandatory in between and what is the current so the current drawn is which we the supplied not the rated this is a rated this is the supplied okay okay everyone but our w is a capital r r we see you will say sir because we are expecting that you guys will secure a hundred percent but of those who secure a hundred percent their copies are reached to look for a scope if some marks can be deducted and these are the places where that happens and we are expecting you guys to do that not the mistake rather the hundred okay yeah exactly for all the three verticals I have two verticals I have used v square r here it is a rated condition it is what rated condition so v by p okay sure here it is an active or working condition where the applied or supplied voltage is counted so applied voltage is acting here r is same okay and here p is equals to v into i so i is equals to p by v okay very good very very good sure relaxed I hope you guys learned some things I hope nothing else do you know any like any evaluator who cuts marks cause they don't like the answer you write hiking is not even a top answers are either correct or incorrect you like the answer you might not like the way the answer is represented will cool just say yesterday I was listening to sharp I was telling give me a k equal to three or that three equal to K. This is wrong way of writing this is the right way sure so incorrect he might he might say that I don't like it but actually this is incorrect you guys all spread those kind of rumors okay surely Varsha don't worry practice sheets will be there that is Arabic style of writing good one but Arabic should be like k equal to three please mute thank you Shobhita no you guys just spread rumors about your friends and your teachers and all they do all see this teacher who just deducted marks because of split and divides is no wrong it's a proper way of marking surely I'm not saying that single like defame the faculty no I'm not stating that I'm just stating an example single don't don't take that because three is a constant a constant is not equal to variable a variable attains a value not a constant attains the value got it yes Navya Bachchan don't worry don't worry relax who wanted increasing and you give decreasing how even that is aren't beautiful like what whoever has mentioned this is very important but especially when ratios are asked especially when increasing or decreasing orders are asked people mess up the answer four is to three is many a time represented as three is to four wrong though in theory paper so there exists a scope that people might get a score there exists a scope okay but in mcq so you won't get a scope increasing and decreasing is different they are writing this sequence and writing this sequence mean different things if they are using the word write them in increasing or decreasing order why are you losing your mind akshita utilize your mind to cope up that difference of four okay ninth grade is an internal exam and how much you got in that paper adit actually adit vishwanath so see 47 by 50 again I am saying theory paper is a considerable case but if you would have been getting 50 by 50 theory paper she would not have agreed to it it happens he might have answered two questions like both the questions of an or part it had happened with me in English article or a she's generally in exam what happens like if I have to check a copy and officially not not on a high altitude like responsibility factor we don't total we award marks and while doing the class distribution the student total and come up and tell their scores Kimira itna I know the banden a kya kya a banden a Mahal no bolder 15 by 15 so the teacher while recalculating will check teacher cancer I got 18 the teacher so check a man I just got a good card here okay internal at the higher I'm a responsibility level it doesn't happen okay so guy I hope guys I hope that you kind of learned something out of it I hope you will utilize these things while responding and preparing for your exams keep learning keep writing it's very important guys this year because your school also were not working so you haven't people consider you guys complain about assignment and all but people consider he saw assignment or writing work come so you don't have that much habit of writing please please please okay write a lot write the theorems of mathematics remember when to use pen when to use pencil where to draw a graph where to draw a diagram how to label the diagram all things are very very vital yeah please do not give them any single scope of reducing even a half month yeah uh morning I guess uh Surya or someone shared with me the date sheet also and also remember cbsc does not do never tolerates colorful figurative representations do not color the figures in cbsc copy no it's a big no good thank you very much for your time guys thanks a lot the recording will be made available the pdf will be shared okay sure for doubts we'll remain in touch anything else feel free to ask merry christmas enjoy the day of tomorrow very clear just just a minute just a please before you leave guys you know that you know zoom links will not be shared any further you know just today also we sent it because we we were expecting that many of you would not know the process so I hope you know the process of how to log in from the lernish platform so all of you have to register there and those who have not uh yes so you have to go to lernish and then from there only all the links will be available so zoom link will not be shared in the groups any further so just in case if you have anything you can always post your question in the respective group if you have any difficulty logging in or something is that fine we will be meeting on uh friday next sorry no saturday saturday evening uh 3 30 with trigonometry so if you have uh revised a bit that will help next saturday saturday yes saturday there's no class tomorrow oh saturday okay friday yeah so tomorrow there will not be any class uh going to christmas so we wish everybody here many christmas and enjoy the day and i'll also invest some time in your academics as well so hence please enroll yourself in the course if you are having any trouble sort it out between today and 3 a 3 p.m on saturday okay thanks a lot so yes okay sir you said uh that you'll be holding a class for ntsc physics uh tomorrow one special class not tomorrow but you're not 25th okay so i'll update that one requested class okay we'll keep an update on that okay yeah and there are a couple of other classes also will be conducting for ntsc which is still pending so just keep a look on our you know forums or the groups which you are part of anyway so we'll post every message over there and keep writing the tests on on saturday again uh uh you know yeah sunday sunday sunday sunday we'll be having testing so came on test mock tests for board exams as well as uh ntsc test uh uh would be there is that fine so you can start with so those who are writing came on i would write i would suggest you go for the came on this time you can take throughout the week or whenever you're free anyways it's a holiday season you have a lot of time so with those words uh let let us you know meet again on uh at three o'clock uh 3 30 to be precise next or coming saturday 3 30 tushar sir it's your lecture only so no problem yes yes okay okay okay bye take care and all the uh you know so if you can check just a minute if you have two minutes i will show you around uncle you can stop sharing your screen yeah i have stopped please yes so uh if you look at my screen here i wanted to show you the dashboard of this yes so you as learner so here is where you have to go to uh the comprehensive course and important links are here you can check the i had illustrated anyways all information is here so you can check the information and session recordings are here guys so math recording is already uploaded okay fantastic today uh we'll be uploading uh the uh the physics one and uh you know if you go to uh week one attachment is there so whatever the pdf we were using is