Eddy currents & their applications (& how to reduce them) | Electromagnetic induction | Khan Academy
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- Опубликовано: 3 окт 2024
- 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
If my teacher would have taught me this way i would have been in some electrical company and not writing codes. Awesome video 👍👍
What's wrong with writing code, though?
People from the electrical engineering branch might the same for their programming teachers as well
@@Just_Moh_it I think they're saying they'd have gotten so much interest in electricity and decided to pursue that as a career instead
@@kalpashri0820 Are you a fellow CBSE board student like me? If so, all the best to you buddy 👍
@@ManishSingh-jz2hx yes I am, thankss and all the best to you too!
@@kalpashri0820 Yo I just started 12th grade!!! You guys must have ur comp exam on monday!!! Good luck and good luck for jee too!!!
I love the way he says “but wait, there’s more “😂😂
I do too
6:53 😂 lmao
he sounds so excited which makes me excited too lmao
Lol
Tooo😅
You nailed the intro. I always thought that the induction cooker worked on the principle of conduction!
The name induction cooker itself indicates that induction is taking place..
But I also thought the same way and only I realised after this video
This channel is one of the reasons why I decided to pursue engineering. This channel made me and still makes me fall in love with physics. Thank you so much:)
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
The person who made this video is actually Mahesh Shenoy, rather than Sal Khan
Love this. He put so much effort into making the lesson interesting
I usually don't comment on educational channels but this can be exceptional case.The presentation of this lecture is beyond praise.Firstly the introduction using a real life example then theory in your words then once we are familiar you use some resources available on youtube to make it more comprehensive....simply wow...Hope you soar high..
Your teaching methods are awesome sir .
It’s always good to know that with your videos physics is much more simpler and interesting ❤️
Tysm
The way he explains the concept has brought tears to my eyes.
This channel increases my interest in physics everytime i watch these videos
I'm eagerly waiting for lectures of the whole chapter to be uploaded! I just love your way of teaching!
Same here 😁
After a while I thought the video was end , but he told " but wait , there is more ! "
The moment is awesome.
I have been looking at videos for about 2 hours and this is 1000% better than any other video i found. I looked down at the author and was like "oh yeah, of course it's this good, its Khan". You guys never slack. Well done.
I like how much passionate he is while teaching. This was so awesome. Great 👍
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"?
You seriously don't have any idea of the working😂.
Do not touch is a caution to not touch for sometime after you have used it or you could possibly get your hands burned
Yesterday I was searching eddy current Khan academy on youtube but there was no video.today you uploaded it.Thx
Me too!
Imagine that RUclips doesn't exist. How easily accessible these type super conceptual materials are.
Great combination of explanation and demonstration.
Love the videos sir. Can you also please add some numericals and questions too? That would get you more views too as that would make your videos a completely free study material.
I am an analog design engineer. Randomly stumbled upon this video. The kind of insight is really appreciated.
OMG Really really great! Please do more videos Mahesh Sir 😎and try to complete all the lessons of 12th std so that we could not only get good marks but gain knowledge of physics ❤️ can i expect a heart from you sir🙂
Why didn't I watch it sooner!! This is awesome! Visualization of the things! Thanks Sir!💕
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.
Agr vessel ke bottom eddy current establish ho jata hai to when we touch vessel to hme current kyo nhi lgta
Brilliant. Just brilliant. I spent about 30 minutes touching up on Eddy currents cuz I couldn't quite grasp the concept. Your vid cleared everything
I watch your videos to learn how to teach :), I am have done my MSc in physics from IITG and I want to be a professor like you. :)
Loved the explanation as alwayss
I cannot explain how much i loved thiss
Wonderful, amazing explanation
Science is the real Magic
Great Channel
Great teachers
Wow! you are giving the great knowledge in lesser time & in better way , AMAZING!
Thank you for this
great explanation. what if the hand fingers are having gold rings? will the ring get hot due to eddy current?
No married man would put his hands on cooker....he lives with one
@@leulunited4913 😂😂
@@leulunited4913 🤣🤣
Excellent lectures. Highly apprehendable. So useful. Thanks
Thank you sir. Finally got it. 😊☺️ You have the ability to teach the any lesson ,in a easier way. Continue uploading more videos . Good luck.🤞
Somebody give this guy an award
What a great teaching method 👏
God bless you sir !
This guy literally answers my questions immediately I think of them 😅
Thanks for uploading this video 😊😊 . It helped me a lot.
sir thank u so so so so much, u really made me fell in love with the science happening around us , kuddos to your brilliant animation explanation ,,,,
Thanks a lot teacher🤗
amazing style of teaching
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 ❤
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Sir ... This is awasome ... very much helpful for understanding the concept
Brilliant teacher.
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...
Amazing outstanding mind blowing fantastic
I love your delivery of the material thank you
Yea cool... one other place where I have seen this.. All the Nam June paik stuff about distorting television images are all due to Eddy currents as well...
Very well explained, highly appreciated. Thank you.
Loved the explanation best lecture on eddy current
This is awesome, this make me convince myself so much easier.
wow that was awesome it cleared my whole concept of eddy currents
It's really awesome to hear you.
I swear God send this guy
Never understood better :) thumbs up for you, teacher
One of the best topic
Fantastic, love your enthusiasm and explanations :))
Nice! Thanks for all the examples!
Really informative
Really great demonstrations and explanation sir🙏
What an amazing video. Thank you.
Suppose we put a conductor on that induction so change in magnetic field will introduce a current on that conductor, when I touch that conductor why I don't get a shock ,
I am very curious to know and sorry if my question is stupid
1. our hand is not a good conductor as mentioned in the video.
2 . since eddy currents form small loops of their own on the utensil even if u touch the utensil on the induction plate u will not get shocked bcos u were never a part of the circuit.
p.s. i answered your question to the best of knowledge i maybe wrong please correct me if it is so!
@@user-rn7ng6zv1j i agree with the first point but according to ur 2nd point one should never get a shock because the circuit won't be complete but in reality humans do get shocks because earth is considered to be at zero potential and since current flows from high potential to low potential so when we touch a circuit we actually serve as a channel for the current just like a wire.... this is why we do earthing to prevent shocks
Did you get the answer from somewhere, if yes please tell because I also thought the same question.
Did you get the answer ?
@@prashankgupta6672 the only way i could get answer is by doing experiment bro
In the eddy current pendulum the speed is lost as the mechanical energy is lost as heat energy due to the eddy currents
One of the best physics videos out there 😍
So if i touch the pot when it's on, will i get shocked?
if the eddy current is running through the pot there's is a chance, isn't it?
(i don't have any of this)
When the water was boiling, I touched the top. It was neither hot nor shocking. It makes sense because most of the eddy currents are at the base, and the heat is quickly transferred to the water. But I wouldn't recommend doing any of these! Be safe!
So In order to get shocked we should touch at the base ?? I am soo curious todo this experiment since I have induction at my home 😅😁😁
@@aniketprasad7700 so how did the experiment go? Are you still alive?😄
Yeah broo
all doubts solved (thanks )
What a teacher!!!!
Awesome teaching
You are a great teacher.
9:51 will the aluminium piece also get heated up
Thanks a lot.
Khan academy>>>>>> school
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 .
I have the same doubt
I LOVE YOUR VIDEOS
sir if that much heat is produced by the induced current why dont we experience an electric shock when we touch the metal bowl.
potential different generated isn't enough to give us a shock
Thank u for valuble service ❤
In your diagram at about 10:00 if the Al swings through a large constant B-field where it is at times moving through a constant field (AFTER it completely enters and BEFORE it starts to exit), the SAME amount of flux is penetrating the Al over this part of the swing...will the braking force be zero here?
THANKS FOR THE CREAT VIDEO!!
Excellent sir thank you for this experiment
In the demonstration of magnetic levitation, the current in the ring moves clockwise I suppose.
Sir immediately post RLC circuit sir plz because 15 th March was our board exam physics
Really amazing concept with you
Why eddy current doesn't shock you when you touch the pot
Awesome 👍👍👍👍
Way to teach
Interesting and lot of awesome information
If induction cooker uses eddy current to heat, then why copper and aluminum utensils don't heat up in that?
"to test it out, I put my hand on it" 💀
for redusing speed of train and couse increse speed both due to eddy current geting confuse
mahesh bro u never fail to facinate me
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 :)
Hearty thanks broo🥺🥺🤝
Awesome teaching ❤️❤️
👌Fantastic mindblowing
EXCELLENT 👍 EXPLANATION.THANK U FOR THIS 💪 REALLY GREAT
What a explanation 😯❤️
Thanks sir
Hey isn't the direction of induced current wrong in the aluminium loop at 8:14.
Please correct me if I'm the one who is wrong here.
Fantastic video!
Excuse me.maybe I mistake.eddy current said to current that in a inductor or transformer with clos loop because of switching created.this discussion has no relate to eddy current.
just wow
Excellent job 👍
Some explanation of heating is not entirely correct ( 3.47) . The heating is due to hysterisis effect in Iron bottomed vessels and which is not (for example) in aluminum or copper vessel)