Electromagnetism 6: Induction

[MrMimicmaker]

I hate 240p. Why cant we like just ban 240p?

[Ulikazu]

240p...we meet again...

[MAUROtele]

poor joseph henry...

[Kesonjeta]

Walnut

[dalsenov]

At 8.00 picture there's a thing I don't understand:

Is there a physical contact between the spinning bar and the conductor? If so,isn't that contact prone to be damaged as a result of the continuous spinning?

[TheZenPerspective]

Was this filmed with a female gooch?

[batdamnm]

Proton-enhanced nuclear induction spectroscopy

P.E.N.I.S.

[Sublime2O]

The background noise lets me know that I'm really dealing with magnets.

[loqkLoqkson]

a galvanometer has a spring to return it to zero

[1XxShenxX1]

Soooo why does the needle return back to zero?

The first coil makes the disc spin clockwise the clockwise motion makes electrons in the second coil move down and the electrons return to the first coil from where it should be looped right?

*Confused*

[mizztalkative15]

You have actually saved my life, I am now seeing for that A* and a life without depression.

[andyelgrand0]

but how can you harness the energy created?

[Squantra]

FUCKING HELL IM SO CONFUSED WITH THIS SHIT MAN LIKE TEN BLOODY HAND RULES AND SO MANY THREE DIMENSIONAL DIRECTIONS TO CONSIDER

[billingretna]

the video is inverted "left hand rule!"

[picaticatara]

gay noise

[orfmor]

It's so abstract :)

[mightypotato]

Fucking miracles...

[akwyd]

This video is wrong, at 5:32 if the S and N are were they are depicted to be (which is correct) current flows in the other direction.

[merdekamotor]

ok.

[HOMeBoYNUMBER990]

why do they have this crappy annnooooyinng music in this video. It's like providing good information, and then threaten you with insanity if you try to listen to it!!!

[sexyrejean]

I knew most of this from young! Everyone should have known this from primary school, also thought about water movements and other materials that can conduct electricity because if it can conduct electric it can be used with magnets in some way. The real secret stuff they never seem to wanna give out is the use and location of organic fuel like some forms of gases and liquids, like i know a lime or lemon can produce electric depending on the metals attatched to the inner citrus of the fruit..

[JeremyNasmith]

@sexyrejean If I'm not mistaken, you need a copper wire for one end of your "fruit battery" and a zinc wire for the other side. A potato works too...

[sexyrejean]

@JeremyNasmith Yep, you go way back, you were listening in school. lol. Its nice to know i ain't the only one that knows stuff wiki-pedia may not. haha wiki, in ya face. : )

[BaltoMovie]

7:43

But won't N attract S??

I'm

Confused cab someone explain this to me in laymans terms

[kukulcangod1]

this are the best lessons on the net believe me I've searched everywhere, bu I wonder where is part number 5 , so called academics are just twisted on other videos,

[sirzig1]

Michael Faraday??

Now I know who the professor Daniel Faraday on Lost was named after!

[domyaska]

excellent

[iorixs]

men are stupid!! go feminazis go!!

[PeaceLoveFairytales]

I don't get lenz's law. what does it mean by "Opposing the orginal movement"?

[girhen]

Think of it like a frictional force for induction. It always acts against the motion causing it (the original movement). If the movement of the magnet is originally to the left, the opposing force will be to the right. 

If it were the other way around, then the induced field would increase the speed of the motion. That would break the conservation of energy principle because you can't increase energy without expending energy elsewhere.

[dan020350]

thank you Nikola Tesla , and the video maker, and user for teaching us about AC

[dan020350]

watching videos are far better then reading the books; it induces my eyesight

[jexphe2k]

What makes the poles reverses its polarity? Perhaps you may want to study the work of Edward Leedskalnin in Magnetic Current before you drift away and mislead.

[Aasmaema]

if you notice how the south pole is attracted to the south pole and vice versa for the north poles... isnt this incorrect? since like repulses like and opposites attract...

[iorixs]

that spinning part is being spun by the force of water or steam i think

[mynameisradar]

@Aasmaema what happens is when the the two same poles meet and repel away from each other the iron core with wires raped around have a different charges. once the core is further away from the magnetic fields

[oliverlover3565]

@Aasmaema I was totally wondering that too... did you ever end up finding out if that`s correct?

[mynameisradar]

@Aasmaema whats happening is when the iron core meets with the magnet with same poles they do repel each other, however the current flowing through the coil changes as it moves away from the end point of the magnet as current changes so does the magnetic field it carries changes. and vice cersa

[sifs4]

@Aasmaema The south pole ISNT attracted to the south pole, the magnet has an external force pushing it forward (like a hand or a machine connected to a crank) despite the repulsion from the south created by the coil.

[jloundy29]

@Aasmaema , The magnets are not being attracted to each other in the video, they are bringing a magnet to induce a electric current. A magnetic field is created by the current that opposes the magnet being pushed through. Its like a normal force when you push down on a table. The table exerts (or tries to) exert a force equal to the force that you are exerting.

[jloundy29]

@Aasmaema

[jloundy29]

@Aasmaema There has to be an opposite force to counteract the magnetic field of the magnet. Think of it as pushing down on a table, the table (tries to) exert a force equal but opposite to create an equilibrium

[elfmotat]

@Aasmaema The geographic North Pole is actually the magnetic South Pole and vice versa.

[Thisisnotmyrealname8]

@Aasmaema The video is right. It depends on which direction the force is applied at the onset of rotation. It can go in either direction. Don't know why you have thumbs up.

[kmarinas86]

@Thisisnotmyrealname8

Right! At 7:14, the video gives many the first impression of an electric motor. But this is without the coil being powered. So we are seeing the back EMF generated by the coil passing by the magnet. Thus 7:14-8:49 is actually the mode of an electrical generator. Thus, one must apply a force to sustain motion. Force it closer, then the magnet induces a repelling field. Force it away, then the magnet induces an attracting field. In both situations, it generates electricity.

[musiclover708]

@Aasmaema ummm when they are next to each other they repel. thats lenz's law. i suggest you watch the video one more time....

[Aasmaema]

@musiclover708 no I suggest YOU watch the video again. Their is an error in the videos production. it should be opposite coming together and then alike to force them apart where as this shows them being forced apart with opposite magnetic forces.

[basslinet]

@Aasmaema its not attracted, its forced

[Generalvaldez]

@Aasmaema its not, notice the direction of the arrows above the magnet and the coil, then notice how the arrows change when the polarity of the coil changes.

[gatoradeee]

@Aasmaema the south poles ARE repelling not attracting. 

[ajnsztajn88]

@Aasmaema

there is everything ok... coz poles at the coils ends change the polarisation at the middle of magnet.

its not atraction,, its repulsion at the first stage, and atraction after the coil leave the magnet...

[stripes13]

@Aasmaema

I think the video is correct. The magnetic attraction between the N and S, and the magnetic opposition between N ans N or S and S, both create the induced magnetic field. You need the change from this "second" magnetic field in order to produce current within the armature. So the applied magnetic field depends on it to produce current.

[dedly13]

@Aasmaema a magnets poles are only named as such because of the way the point in the earths magnetic field, if you imagine the earth has a giant bar magnet inside the north pole of said magnet would be at the earths south pole! people really need to name things better in science lol

[Schutzenegl1]

@Aasmaema That is why you need the driving physical force of the generator, otherwise it would move all by itself and violate several laws of motion and conservation of energy.

[technologycrazy]

Thx this makes sence now. Ps I am 13 and you explaned it good so I understood

[charliebravo7]

u sould rather study spelling instead of physics...

[technologycrazy]

@charliebravo7 ha ha its cause i had to type on my ipod

[Simphany]

@charliebravo7 lol:P

[KazeOo]

You should rather study spelling instead of pointing out spelling errors. Jackass.

[charliebravo7]

it was meant as a joke, but if you didnt get it, im deeply sorry...

[KazeOo]

It wasn't funny. It was retarded.

[charliebravo7]

okay, my bad ;)

[gaz323]

Steve, I'm trying to learn more about electromagnetic induction, and this the best tutorial that I've come across so far. Thanks for putting this together. Regards Gaz323.

[pnut418atyahoo]

alternating current aka ac current versus direct current aka alternating are derived from each other through a routine utility line where direct current is traveling energy from the utility company pulsates it back and forth thru a normal transformer connected as we all see up high connected to a utility line pole. Conversion of dc to ac is very important for two reasons: It's economically to produce from utility plant so in the end we all have a lower bill!

[amartinjoe]

nice 80s graphics! very informative video; loads of stuff; thanks for the upload.

[subzerostorm]

so having a magnet moving backwards and forwards to a conductable coil creates a current in the conductable coil and this is called induced current and the process repeated over and over again produces alternating current giving pulses of electricity

[Bella451001]

nice !!its really catchy hmm....very helpfull:)

[coldfierynite18]

so magnets make electricity...never thought about that

[PlutonGB]

@coldfierynite18 are you stupid??

[saminasubhani]

@coldfierynite18 and vica versa, electricity (currents) cause/induce magnetic fields

[youbintubinallday]

This video is excellent. It really breaks things down well.

[domyaska]

thanks a lot..very useful

[cherissalim]

Thanks :) it really helped.

[FlavoredCoffeeGuy]

Permanent magnets interact differently than electro-magnetic fields on a transformer's core. So, what is true for a generator may be different when or while using permanent magnets. Permanent magnets do cause a reversal of current flow when the number of magnetic lines reverses direction through the coil. So, there is a very clear difference and I don't understand why I am the only one that's built a circuit to recognize that.

[FlavoredCoffeeGuy]

I've built a few circuits, and ya' know, the current never reverses in the secondary unless it reverses in the primary. An inductor works to keep current flowing in one direction. This is equally as true for the primary as it is the secondary. The only reason I can think of for Faraday's results is that the iron ring is carrying an intense eddy current. But, in no transformer I have ever seen does pulsating DC convert to anything but more pulsating DC on the secondary. Inductor A, Inductor B

[Ziran007]

Great video, really needed a summary such as this one! =)

[s2Cynthia]

Thanks! I saw this in my physics class. I have an exam tomorrow and this really helps!

[99rhetbaboons]

Is there a part 5?

[sidbud21]

Thanks a lot for posting all this.

Definately beats reading through the books for the basic concepts. :D

[heath67846r]

thank you soooo much!!! this was an awesome help!

[GingleGangle1]

Put subtitles!

[darinalex]

wow

as much as i need to watch this

i almost fell asleepp lol

couldnt make it throu the 3rd minute

[jonathanv11]

muy buen video,es mas informacion

[tady1001]

wrong......

[fazzification]

this is hillarious !

[nbm34]

We all need to seriously get car alternators link them in series to batteries. and get off the rip off energy grids. I am in the process of using five alternators turned by one linked to a Tessla steam turbine, these charging five batteries. I use a heavy govenor with the turbine.

[esQo0020]

beautiful realy good and i understood everything .rly good

[windoes98se]

i bet i could make 1 phase ac current by

making some type of high speed swiching rig wit the coil in 2:28

[Sixalienasa]

Hey Dude, where is Part 5 on generators?

I need it. So do me a favour and get it up here sharpish Dude.

[Xykarioz]

this is like from 1980

[nbm34]

WHAT IS DISGRACEFUL is it WAS TESSLA who discovered the principles of alternating currency that was of practical use. YET EVEN TO-DAY official lectures on science rarely mention his major contribution AND INVENTION of the motors we all use to-day as AC motors.

[ppardee]

Tesla WAS a wizard. His influence is felt in nearly every modern electrical invention. He does have a unit named after him, but he is almost NEVER mentioned in science. He was just too strange for society at the time. Sad :(

[gotfag]

I thought it was a right hand rule, not left hand :S

[Jays0n54]

right hand rule is used for determining the direction of the velocity of a rotating object left hand is for this stuff

[igormon]

Its all just different times. The only difference is in the older days your left hand thumb would be pointing in the direction of the current, these days people say right hand rule because its the thumb pointing in the direction of CONVENTIONAL current. conventional current is the opposite of normal, so its all just arbitrary, different times, its the same shit, you get the same results in the end whichever rule you use.

[Jays0n54]

I disagree. Conventional by definition is normal or things agreed upon also called "norms", my original thesis, in my opinion, is still correct, two rules for two different situations.

[Xykarioz]

in french the hand is the RIGHT hand for the Laplace force, in english, its the left, flemmings one

[sspoke]

haha this explains AC current much better then anything I've ever read about. Now I know how Tesla discovered AC current it was all luck with magnets.

[troponinnutrition]

I'd imagine Tesla would dislike your choice of words here. Tesla's disdain for Edison and DC current was Edison's apparent reliance on redundancy and the "luck" that tends to stem from it.

[lyndieBABY]

calm down nerds.. go and read more books

[ycats1000]

haha...

he said redundant-

[narshil2]

nice work keep it up but i think ur missing part 3 or 2 not sure

[Arkthurius]

Very cool video and explanation.

[DarkTrunksGeorgeSim]

although it lacks some Frames per seconds there ¬¬

[moondog8]

Great job! Explaining concepts with written words is so cumbersome and subject to interpretation. Computer graphics is far superior for most people to learn with. Words are so limiting, especially written words. One can learn more efficiently with images. Can I join you? This has been a life long dream of mine.

[Obelisk155]

Interesting.