Voltage

[bladevampirekidway]

I'm trying to learn Amateur radio by myself from a textbook. Your videos help so much when I get stuck with things I don't understand. Much thanks! :)

[yaaki7]

It is interesting how we pay thousands of dollars a semester for an "education", but we all come here to learn for free. A majority of my teachers hate their jobs or they are terrible at it. A lot of them teach just to satisfy their egos. When education is free, only those who truly want to teach and better the world would actually teach.

I think we need to reconsider why we give our colleges and universities so much money.

[TheYoutellmemyname]

Looking for skrillex :o

[laeiouVelvetropes]

@menachem700 When the net force is zero, it just means that there is no acceleration involved. Movement is still possible, it's just that the charge will move at a constant velocity (0 acceleration) while the opposing (with respect to the force of the field) 6N-force is being supplied.

[johann2779]

what the name of the next video, I have to figure out the moving energy from this formula V=(1/4πɛ0)*Q/r And E = Q*V can somebody help please

[kindziukcentrumxp]

this is more understandable then, my doctor, but the best of this is, that English is not my native language :)

[menachem700]

I have always had a problem understanding a concept in physics: when you say that you need to push with 6 N to oppose the force of the electric field of 6 N. wouldn't that mean that the object would stay stationary??? why would that move it? they both balance each other out. it's like me and you pushing at the same magnitude in the opposite direction. nothing would happen right???? why would the charge move??? ahhhhhhhhhhhhh

[IBTOJ]

@menachem700 Don't get confused, you are right ! at the beginning we have to push a little more than 6 N and then go back to pushing with the same force ( 6N ). they ignore this because it does not really matter in calculations.

[RimstarOrg]

@menachem700 Further @IBTOJ's reply, at 4.36 he did say "and actaully I'll have to get it moving initially". I had the same question you did and missed him saying it the first time around.

[Be1smaht]

What is it about E-statics that is so hard to explain. The concept is so weird I think. I read 3 books on this stuff, but you explained it well., tHANK YOU !1

[forchonaporch]

my physics final in 12 hours. you are my hero.

[bossface009]

i love you

[Calz4]

Question:

If the particle had a negative charge, this would mean the electric potential energy was negative (right?). What does that mean and how can an energy be negative?

Does it mean you would have to apply a force in the direction to the electric field to stop the particle being attracted to the plate? I'm a bit confused about that

[piratepat44]

Everyone should realize that you can have electric potential with only 1 point!

In this case, it would be with the joules per coulomb required to move a positive test charge from infinity to the point.

[vladislav91]

Hmm. Electric field is pushing charge to the right with 6 (N), I'm doing the same to the left with 6 (N). 4:40

Why charge prefer to move to the left? Why it prefer to change 3 (m) to 1 (m)?

[sam3942]

It's really nice to see numbers in the examples; my prof did it all symbolically and we tended to get bogged down in the signs. Thanks.

[hiBrianhello]

what the fuck this is confusing

[Gearz86]

Good ol physics 2. I don't miss it, lol.

[hendsem]

i think you can spice up your lecture a little bit by suddenly and randomly drawing tities. or small dongs all over :)

[TheHereticAsian]

@hendsem i think you should grow the fuck up

[najmunsyakirin]

obviously you know what problems most students have ;P

[frank0067]

myself i would ignore ..potential stuff.. it complicates things

[tamo1]

nice work!

[Taowhr]

Hey guys, if you are still confused. Here is another way that I think about Voltage because Sal's video doesn't explain enough.

Voltage can be thought of as the amount of energy that I need to move a particle from one place to another for every coulomb or the amount of energy to move one coulomb to one place to another.

In circuits, just think of it as the amount of energy to move one coulomb from a negative terminal to a positive terminal.

[Gunitballer]

you're a lifesaver

[bogolds]

great explanation and the analogy to 'gravitational potential' really helped. thanks

[zenith828]

why does this guy making tutorials on youtube teach better then my teacher who has a teaching and mechanical engineering degree, and gets paid for what he does.

[TheVeryConfused]

Check out Sal's credentials his website, afterwards you might see why he's a more effective instructor than your teacher.

[FretArchitect]

Best video explaining voltage I've ever seen. Thanks so much!

[czechoslovakia1000]

love it

[rinwhr]

5:42 doesn't he mean 12J lower?

[orangeduckster]

oooooOOoooooOOOOooooOOooo

I get it now. Spent 2 hours trying to understand this, but I got it in 8 min 55 seconds from this video.

[hokman1]

where is the next video with the examples??

[tronulu]

@hokman1 I think there isn't one

[Ipikop]

didn't confuse me at all. found this vid a nice supplement to what i'm learning at the moment. cheers.

[jamescboyd]

naw, just thought it was funny. love the vids, thanks.

[jamescboyd]

you can see us when we watch your videos?

[tronulu]

@jamescboyd troll?

[Garotte72]

Awesome explanation! I've been struggling with the concept of Voltage for the longest time. Thanks for clearing it up.

[hernandezhn57]

Thanks so much

[baba1014]

omg you are totally saving my butt in physics! my physics teacher does not teach at all, and its hard to learn it by myself! thanks to you i might actually not fail the ap test

[mohammadhamedalikoza]

People how didn't understand " read the energy and work " ones again.

[74mutt]

i don't understand

at +2c ,it has 6 N push at one side and the oppisite so why that +2c move ?

and you said that the point you marked with pink has greater potential energy than the other point =12J

ƩW= [6+(-6)]N·2m

ƩW=0≠12

why

pls help,

i really don't get .

[wisestfoolalive]

u have to exert AT LEAST 6N for two meters to balance the opposing forces. Once the forces are balanced then you can then apply wateva arbitrary force (preferably a very small one), wateva gets the point from A to B. obviously doing this you'll get different value for work and so on. So Sal assumes your familiar with newton's 3rd law and vector net force so he focuses mainly on the concept of elec potential energy.

[mohammadhamedalikoza]

See: from + 6 N force act on object if we push 6N only we make it constant and then we want to move it so we add more force, so we can move. also when object become closer the force will be more ( like magnet ) when it is closer it more force we need and word = force x distance.

w= (12-6) 2 N.m w = 12j

[rinwhr]

@74mutt, he meant that the electric field

is pushing with a constant 6N and it takes 6N to push it back at least.

[jccarbunkle]

That was tight

[jarnapo]

Excellent! This is just what I needed--thanks! I like the way you applied stuff from first semester physics (W = Fd) to derive these new concepts: it follows a lot more simply than my textbook.

[scissorzaxen]

This will cheer my classmates up!

[hai2410]

This was probably the most useful video i've watched so far from this guy, and thats saying something.

Its very noticeable the sheer scale of the praise these videos are getting. well deserved

[mindsoulbody]

Now this is what I want to hera from professors. Thanks this filled up the gaps in what I knew. Very helpful. XD

[wickedcool4yes]

Thanks so much! A lot of teachers give the equations that use these terms without explaining the science behind them. This has helped a lot.

[unk045]

i have a test and would appreciate a speedy response..shouldnt the force be negative therefore causing a negative work when we solve for work

[bojan9981]

Thanks! very helpful.

If I could just recommend, it would be helpful if they video followed each other by name so that they are easier to find. Electric Potential Energy 1 of 3..2 of 3...

Thanks again!!

[capam2]

Better than my prof!!!! I can't believe it jajaja

[desiretolearn]

Indeed this is great. I had a very difficult time grasping this, but now I think I understand the underlying concept. Keep Up the good work.

Thanks

[554218kragen]

DUDE this is great!!!!!!!!!!!

[rayram55]

Thanks for the lecture on electricity. This is very useful.