Transformers - working & applications (step up and step down) | A.C. | Physics | Khan Academy
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- Опубликовано: 12 сен 2024
- Transformers step up (increase) or step down (decrease) AC voltage using the principle of electromagnetic induction - mutual induction. A changing current in the primary coil induces an e.m.f in the secondary. Since the e.m.f generated depends on the number of turns, the voltage induced in the secondary can be changed - stepped up or down - by altering the turn's ratio.
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Created by Mahesh Shenoy
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Hands down, the best video on transformer. I ever watched!! Thank you sir for being such a great teacher!!
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I have a doubt
If the change of magnetic flux generated can produce the same amount of emf in another coil(secondary)
Then wont the change of magnetic flux induce the emf in itself(primary coil) and affect the flow of current in it?
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We've all been using wireless charging all this time 🤯
Is emf essentially the same as potential difference?
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This is literally the best lecture on tranformers, great explanantion all doubts cleared. Most of the other videos I found were mostly just definition and formula based due to which I couldn't actually get their working.
Very well explained, better than my teachers!
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Sir but current increases on decreasing the voltage
That means microwave needed less current than charging mobile
Everything is here I wanted to know
Thank you very much Sir, hope we'll learn many more from you
Great video. Coming from someone like me, who knows zip about electronics, that's a HUGE compliment.
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I understand all.Thank you.
Do feromagnets and soft metals do the same thing which is to suck in the magnetic field lines?
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Why not use a potentiometer to vary voltage instead of transformer?
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Although I can understand English, there are many students who understands better with Hindi narration and you can also reach a wider audience with this
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He's an American based educator.
There are many who dont know hindi too and i am one of them. What abt that
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Best explanation I had ever seen
Sir how does energy transfer happens in primary although it is inductor circuit and it does not dissipate any power??
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additional on top
Doesn't "e" stand for the emf that is induced in the second wire, so wouldn't Vp=Vs?
I think Vp equals Vs only when it is ideal aka no flux losses and Np equals Ns
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Sir what if I give an AC supply of 9V to tranformer (step up) can it give a high voltage??
You can step up a 9v battery.
Super helpful!