Eddy currents & their applications (& how to reduce them) | Electromagnetic induction | Khan Academy

Eddy currents are current loops formed over conductor surfaces due to changing magnetic flux. They are useful in induction heating, levitating, electromagnetic damping, and electromagnetic braking.
They can be minimized by adding slots in the conductor surface & laminating.
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Created by Mahesh Shenoy

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What's wrong with writing code, though? People from the electrical engineering branch might the same for their programming teachers as well

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You nailed the intro. I always thought that the induction cooker worked on the principle of conduction!

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mr. sal khan as a student who was on the verge of tears over this, you've made me understand in a way that'll stick with me for a lifetime. thank you for making these videos

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The person who made this video is actually Mahesh Shenoy, rather than Sal Khan

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After a while I thought the video was end , but he told " but wait , there is more ! " The moment is awesome.

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wow that was awesome it cleared my whole concept of eddy currents

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I love your delivery of the material thank you

[@dishajariwala9741]

Loved the explanation as alwayss

[@qualquan]

Good but 2 points: 1) Eddy currents mean CONCENTRIC currents. Hence they require a solid and not a loop conductor . 2) To most effectively reduce them the slits must not leave a border on one side. They should go right through the border.

[@pushpendrasinghshaktawat6241]

Agr vessel ke bottom eddy current establish ho jata hai to when we touch vessel to hme current kyo nhi lgta

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Very well explained, highly appreciated. Thank you.

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What an amazing video. Thank you.

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What an excellent explanation sir!...really lucid,intuitive...loved the way u explained in such a short time, yet completely...kudos to u r efforts...

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Excellent sir thank you for this experiment

[@rishabhkumar4593]

Yesterday I was searching eddy current Khan academy on youtube but there was no video.today you uploaded it.Thx

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Me too!

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Really great demonstrations and explanation sir🙏

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Fantastic video!

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great explanation. what if the hand fingers are having gold rings? will the ring get hot due to eddy current?

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No married man would put his hands on cooker....he lives with one

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[@k2n3l]

0:53 - when his hand is on the induction, it seems to not have been turned on. See the display. While when there's water there's the number that actually does show up when it's turned on. More seriously though, why do induction stoves have a warning label over them saying "do not touch"?

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Sir ,I have a question that if a conductor is pass through constant magnet field ,motional emf is induced .what will happen if same conductor pass through fluctuating magnetic field,does it also induced moional emf Edit - your teaching skills are really helpful for students ❤

[@Bird-0]

Do these maglev trains use guided pockets of these electromagnetic fields that are passed down the railings? I'm imagining it as an air hockey rink that manages to adjust airflow to purposefully guide an object of a known position (as the cabs themselves would be locked into place by the many individual currents necessary).

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Thanks sir

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In the eddy current pendulum the speed is lost as the mechanical energy is lost as heat energy due to the eddy currents

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One of the best physics videos out there 😍

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why cu and Al pan don't work on induction cooker event if they have high eddy current flowing through them....the heat energy is I^2 rt .

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I have the same doubt

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nice video

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[@goddess_ofchaos]

but if current produces heat, how do we not feel the heat of the coil inside the induction plate as we put our hand on it? Or do you feel it a little bit? or is the coil designed in a way that there are a lot of air slots between each wire?

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[@4leafclover202]

Wouldn’t the current induced in the ring be going the other way? If the magnetic field is in that direction?

[@oddjobbob8742]

You can experience the power transmission in your hand if you knit a glove out of iron wire and slip it on your hand then slide lace your hand on the top of the burner.

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"to test it out, I put my hand on it" 💀

[@naphatfueangfoo1764]

Why eddy current doesn't shock you when you touch the pot

[@user-qe5bs7dk8e]

Very Good lecture ! Just a note on the origin of the name "Eddy currents". There is no Eddy guy who discover it. It's called Eddy in reference to "eddies" which are "localised areas of turbulence in water"(Wiki), aka whirl. In french it's called "Courants de Foucault" and there because it is Foucault that discover it. In german "Wirbelstrom", "wirbel" is translated by vortex which is quite close to the "whirl". Still, science keep be logic in naming thing when it doesn't used the name of the guy, and yes it was easy to get misleaded here. Still very good lecture :)