Why current lags voltage in inductors (logic) | Alternating currents | Physics | Khan Academy

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  • เผยแพร่เมื่อ 10 ม.ค. 2025

ความคิดเห็น • 77

  • @lone_berserker
    @lone_berserker 3 ปีที่แล้ว +56

    Highly appreciate the effort that went into animating this stuff, the excellence in teaching the concept to make it crystal clear, the humor which makes this all interesting. This channel truly deserves more attention.

  • @colorx6030
    @colorx6030 11 หลายเดือนก่อน +8

    I love how the way he's explaining this is just like how you would tell a bedtime story. You can hear the fun in his voice.

  • @SAFELORE
    @SAFELORE 3 ปีที่แล้ว +18

    Without any doubt we can say that Mahesh Shenoy is the best K12 teacher in India. Your content is way better than any TH-cam channel handling the K12 content.

  • @tanmayking3252
    @tanmayking3252 3 ปีที่แล้ว +8

    The way you say "beautiful, isn't it" makes it even more beautiful ❤️❤️
    Keep going ❤️

  • @mibrahim4245
    @mibrahim4245 3 ปีที่แล้ว +25

    The analogy in unprecedented!! Excellent !!.. but, still I wished if you mentioned what happens regarding the back emf and magnetic field

    • @NumbToons
      @NumbToons 2 ปีที่แล้ว +4

      exactly

    • @mattbattistel1342
      @mattbattistel1342 6 วันที่ผ่านมา +1

      Yeah... like I don't want to criticize these videos because they are generally top notch (like A+ tier) but in this case... it would be better to explain the inductor with EM theory and not mechanical stuff.
      You explained what's happening inside the capacitor (a couple videos later) really nicely, and wish you could have done the same here. Although the maths might be the same for the analogy you've given... It doesn't actually help us to understand what's going on with the inductor.

  • @thedreamingtechie
    @thedreamingtechie 2 หลายเดือนก่อน +1

    the genuine passion in your voice is very addicting.

  • @raghukancharla6004
    @raghukancharla6004 3 ปีที่แล้ว +6

    plank analogy...mind-blowing...

  • @grenimalidamaja
    @grenimalidamaja 3 หลายเดือนก่อน +1

    thank you so much for the animation and everything… awesome quality

  • @maximgodov7010
    @maximgodov7010 3 ปีที่แล้ว +7

    The analogy is brilliant but it doesn't help in uderstanding why, for me at least. But it sure helps to remember that it works that way

    • @karthikchowdary4184
      @karthikchowdary4184 2 ปีที่แล้ว +4

      dude as the current changes[increases] emf is induced in the inductor which does not allow current to immediately pick up with the voltage,it oppossses that change.When voltage is zero that would be the maximum current,it is like giving an decreasing acceleration to a body on friction less surface[since resistance is zero] and then changing the direction of acceleration[decelarating it] and at half cyle of voltage it becomes zero since it has gained that amount current in that half cycle of voltage.hope u understand .

  • @Smokingnirvana
    @Smokingnirvana ปีที่แล้ว

    I just want please don't stop teaching, mygod what an explanation.

  • @Pushed2InsanityYT
    @Pushed2InsanityYT 3 ปีที่แล้ว +6

    6:52 this is lineally why i'm here, no one else in this rat race is wanting to answer this question. Thank you for explaining.

    • @pdschannel9552
      @pdschannel9552 3 หลายเดือนก่อน

      For real bro🫠

  • @jagadishmorabad2293
    @jagadishmorabad2293 2 ปีที่แล้ว +2

    We can also use the analogy of simple pendulum where, voltage as displacement and current as velocity of pendulum
    At mean position displacement is zero anf and velocity is maximum

  • @feelingzhakkaas
    @feelingzhakkaas 3 ปีที่แล้ว +2

    outstanding explanation with the sliding box analogy.........remarkable video ..........prize winning i would say. God bless you sir.

  • @jacobvandijk6525
    @jacobvandijk6525 10 หลายเดือนก่อน

    @ 6:52 For me, the intuition is in the equation V = L . di/dt. It simply says that the voltage is high(est) when the slope along the current-curve is big(gest).

  • @sugurufoundation4127
    @sugurufoundation4127 7 วันที่ผ่านมา

    Just two words : Thank you sir

  • @harshkhulbe4935
    @harshkhulbe4935 3 ปีที่แล้ว +1

    Waaaoooohh!!! That analogy was superb 🤯

  • @rajkasaudhan8293
    @rajkasaudhan8293 2 ปีที่แล้ว

    God of teaching , not met such teacher in my entire life ❤️

  • @manuellopezanido
    @manuellopezanido ปีที่แล้ว +1

    I really like this explination, I was looking for somenthig like this. Thank you very much

  • @vaibhavtiwari8113
    @vaibhavtiwari8113 2 ปีที่แล้ว

    U r just 💫 ...
    Your explanation ,your animation everything blows up my mind...
    I've just opened your video because I'm stuck on the sin function of the derivation... But suddenly the lecture ended ... Everything was just *frictionless* ❤‍🔥

  • @chathurikadilhani1951
    @chathurikadilhani1951 2 ปีที่แล้ว +1

    Highly appreciate ur effort for making a clear image of these concepts ❤️

  • @tenzindorjee7689
    @tenzindorjee7689 3 ปีที่แล้ว +2

    Beautifully explained 👍🏻 loving physics ❤️

  • @lucarioind2203
    @lucarioind2203 2 ปีที่แล้ว

    my goodness you are crazy...so simple but noone even dare to think about it

  • @aahilrafiq4850
    @aahilrafiq4850 3 ปีที่แล้ว

    Amazing Analogy , now I clearly Get it ,Beautifully Explained!!!

  • @lekhatishbedse2275
    @lekhatishbedse2275 8 หลายเดือนก่อน

    When God sends a physics teacher , this happens 👌🤩

  • @muhilkumara8194
    @muhilkumara8194 3 ปีที่แล้ว +1

    Great example sir 👌👌😙😙

  • @madscience8302
    @madscience8302 3 ปีที่แล้ว +2

    Love u shenoy sir ❤️❤️❤️❤️❤️❤️

  • @amirphilip2234
    @amirphilip2234 ปีที่แล้ว

    Excellent and amazing teaching method.

  • @mohammadzakaria6707
    @mohammadzakaria6707 ปีที่แล้ว

    A quick reminder the voltage graph will be higher than the current graph although the video is definitely the best

  • @MATHSdotPHYSICS
    @MATHSdotPHYSICS ปีที่แล้ว +1

    Appreciated.. but how is the AC voltage maximum the moment we connect it to the circuit? Should it be 0?

  • @aalaa4146
    @aalaa4146 2 ปีที่แล้ว

    You are a great teacher !!!

  • @shreyakundu9331
    @shreyakundu9331 9 หลายเดือนก่อน

    Is this man even real? ( Asking with teary eyes)

  • @roobear5357
    @roobear5357 ปีที่แล้ว

    That’s a wonderful analogy with the plank and the box! And it may even hold at high frequencies, since it would seem, the box would be “bouncing “ up and down more than moving laterally along the plank and thus signifying very little current due to the greater inductive reactance.

  • @YahitsI-c1g9e
    @YahitsI-c1g9e 9 หลายเดือนก่อน

    Just amazing ❤

  • @Dhyaneshwar-um6ln
    @Dhyaneshwar-um6ln ปีที่แล้ว +1

    With the analogy, what about when we just turn on the voltage and the current being negative maximum?How can we explain that?

  • @Z-eng0
    @Z-eng0 3 ปีที่แล้ว

    Really great analogy, and it's not too far from the real magnetic field and emf analogy, just different naming

  • @b.srinivas9567
    @b.srinivas9567 3 ปีที่แล้ว +1

    Waiting for capacitor video😁

  • @kalpanakumawat6857
    @kalpanakumawat6857 ปีที่แล้ว

    How nicely explain 👍

  • @shebanisarkar3070
    @shebanisarkar3070 3 ปีที่แล้ว +1

    I wish our shool teachers would teach this way in online 😓

  • @factsss7
    @factsss7 3 ปีที่แล้ว +1

    Thank thank thank thank thank sir ji love

  • @nikis7742
    @nikis7742 ปีที่แล้ว

    anology of plank was awsome i appreciate your imagination sir

  • @praveenkumarmorabad1358
    @praveenkumarmorabad1358 2 ปีที่แล้ว

    Thank you sir 🙏

  • @aniketprasad7700
    @aniketprasad7700 3 ปีที่แล้ว

    here my analogy to this question
    notice that the current is higher when change in voltage is higher, this can be explained as follow
    since inductors hate change in current the the inductors will introduce high EMF when there is high change in voltage and this is why we toke derivative in the derivation of current

  • @saifullahmushtaq4628
    @saifullahmushtaq4628 2 ปีที่แล้ว

    Very informative

  • @navindraarjunaabeyesekera7864
    @navindraarjunaabeyesekera7864 2 ปีที่แล้ว

    Good explanation

  • @klevisimeri607
    @klevisimeri607 2 ปีที่แล้ว

    Lovely!

  • @vaibhavkrishnamahesh8128
    @vaibhavkrishnamahesh8128 ปีที่แล้ว

    great teacher no doubt, V is directly proportional to I , so v=ir, I=v/r so v> I , then phase difference of inot should be less than vnot right sir ?

  • @montir4510
    @montir4510 3 ปีที่แล้ว

    Thanks sir

  • @shiwamkarn5215
    @shiwamkarn5215 3 ปีที่แล้ว

    Amazing

  • @ahmednasr6171
    @ahmednasr6171 3 ปีที่แล้ว +1

    When I open the volt the inductor resists the current but doesn't that mean it will resist the voltage also?

  • @omkarade746
    @omkarade746 ปีที่แล้ว

    What about ohm's law...

  • @ayuankhan4318
    @ayuankhan4318 2 ปีที่แล้ว

    What is current at that instant when mechanical analogy starts at Vs=0 ?

    • @karthikchowdary4184
      @karthikchowdary4184 2 ปีที่แล้ว +2

      bro he related velocity with current so if velocity of the anology is zero then current would be zero but still has voltage

  • @Jaydeep418
    @Jaydeep418 2 ปีที่แล้ว

    Which playlist does this video belongs to? Can I get the link 🔗 of that playlist?

    • @vivekgupta3692
      @vivekgupta3692 2 ปีที่แล้ว

      th-cam.com/play/PL2ub1_oKCn7ruZr0B-ZxHcJb7tSRS0HlO.html

  • @tarunnagarajan4888
    @tarunnagarajan4888 3 ปีที่แล้ว

    I'm starting to become a fan of a teacher ,thats strange here at TH-cam we only become fans of singing cats.

  • @HJeff
    @HJeff 3 ปีที่แล้ว

    Is this Sal speaking with an accent?? Everything else is identical. The intonation, handwriting, etc.

  • @rajeshchandrasekharan3436
    @rajeshchandrasekharan3436 2 ปีที่แล้ว

    Why the quantity of current shown more than voltage in the Graf? Normally valu of current less than voltage, please explain

    • @pranilshoots9523
      @pranilshoots9523 ปีที่แล้ว

      The magnitude of the voltage and current are taken are arbitrary (random). Its just to show the difference in voltage and current. Technically we are not comparing the magnitude of the voltage and current5 but just the phase.

  • @abhishekshinde8913
    @abhishekshinde8913 3 ปีที่แล้ว

    ❤️❤️❤️❤️❤️❤️❤️

  • @shilpakhatun4526
    @shilpakhatun4526 2 ปีที่แล้ว

    Wow

  • @tsew1ng
    @tsew1ng ปีที่แล้ว

    Salut.

  • @vivekbaagan5778
    @vivekbaagan5778 ปีที่แล้ว +2

    With full hope of finding an answer to my doubt, I opened khans video, but i really get disappointed. My question is, how can an inductor attain negative maximum current as shown in the graph at the begining even before voltage starts increasing from zero value at t is zero? Nowhere in video this point is touched.

    • @simozy4475
      @simozy4475 ปีที่แล้ว

      were you able to find an answear, i have the same question

  • @user-nj7mf7ps4s
    @user-nj7mf7ps4s 3 ปีที่แล้ว +2

    The analogy made is trash.

    • @pavansakthivelvijayakumar7756
      @pavansakthivelvijayakumar7756 3 ปีที่แล้ว +2

      You need to have brains

    • @biswaranjan_4425
      @biswaranjan_4425 3 ปีที่แล้ว +1

      If this is trash then I think you are Einstein ..isn't it?

    • @user-nj7mf7ps4s
      @user-nj7mf7ps4s 3 ปีที่แล้ว +1

      @@biswaranjan_4425 no bruv. I am Newton.

    • @biswaranjan_4425
      @biswaranjan_4425 3 ปีที่แล้ว +5

      Yeah pata tha.
      You gave wrong interpretation of light theory and by youtr time electromagnetism unified theory didn't exist..so yeah..it's difficult for you to understand..I get it...get some knowledge of new physics of our time.

    • @NiharikaAChirayil
      @NiharikaAChirayil 8 หลายเดือนก่อน

      If this is trash your garbage