The LC Circuit (part II)

[@azaug1]

at 3:09, I think that should be a cos instead of a sin. That way the mechanics analog would match up and the derivative of sin(wt) would be cos(wt).

[@会痛的石头]

the derivative of cosx is -sinx tho

[@georgereeves9374]

Excellent, down to earth explanation. Your KZbin videos have become invaluable teaching tools for on line instruction during this time when face to face instruction is not possible. Thank you!

[@fahmylina123]

This is a perfect electromagnetic analogy to the mechanics of oscillation of a swinging simple pendulum and that of the oscillation of a swinging spring, and the change of their kinetic energy into potential energy, and then back and forth to kinetic energy and then to potential energy, due to mechanical inertia, but here it is an electric inertia,however, the two sets of equations and their derivatives are completely equivalent. Fantastic indeed.

[@lasseviren1]

I agree, fantastic indeed. I enjoyed your summary of this idea. Thank you.

[@fahmylina123]

lasseviren1 Thanks. In fact, a little number of people says thanks for anything nowadays, and this is too bad. You and me are not of those group of people as already we opt for saying "thank you", and this great enough

[@Debjit625]

+Mohamed Fahmy Ok now thank you is oscillating between you two.... Thanks for your statement its really nice

[@davidcolasante8173]

Beauty! This series is worth viewing periodically. Thanks!

[@lasseviren1]

Yes. Eventually the energy goes to heat and electromagnetic waves being sent out from the circuit. Accelerating charges create electromagnetic waves.

[@gonzothegreat1317]

3:13 You made a mistake. The derivative of -sin is -cos: so El= L Q_o w^2 cos(wt). The plus and minus signs (cfr. El and Fnet) do not appear to be the same. Is this still correct?

[@NvVortex]

it should be cosine, however, the positive is because you take the negative derivative of the current so the analogs are different signs.

[@fermixx]

i guess it doesn't last forever. Is the resistance of the wire the analogous to friction? Both transform some of the energy to heath, right?

[@SuperZbx]

U made this concept like a kindergarten math! Thank u so much!

[@saraparker8915]

At 3:10 : Shouldn't the sin bi -cos ??

[@SlimShady.1990]

Yes

[@TheDanischannel]

+Sara Parker Exactly my point.

[@UchihaKat]

Inductors are supposed to resist change in current. So it switched because the direction of the current switched.

[@djpremier333]

I think you made a mistake, the derivative of -sin is -cos so Aw^2cos(wt), hope i'm not mistaking myself..

[@yoramstein]

Hello lasseviren. Thanks for you lectuur.REMINDS other similarities in Physics for example:equation of Force between charges F=k Q1xQ2/R² is similar to the equation of force between Spherical masses(or any mass): F=K x m1 x m2/ r² One is our god. That is mistery of Physics which makes it facinating.

[@pankajmeghani9016]

Ten years in... and still helpful

[@canUfeelthaheat]

Couple things. I want to say I love your videos dude, they are helping me study for my physics final right now. And now a question: When the capacitor is fully discharged and the current is a maximum, you said that the inductor acts as a battery to continue pushing the charge to the next plate. I thought that inductors acted to REDUCE current by pushing it in the opposite direction or something? Could you please clarify?

[@Greg_Chase]

At the moment the capacitor is fully discharged, this means the magnetic field in the inductor has all the energy that was in the capacitor. It also means current flowing FROM the capacitor TO the inductor has stopped (the inductor current is max) - the capacitor has no more electric charge in it to sustain current flow, so current flow FROM the capacitor stops. Recall that inductors will not allow sudden stops in current flow. When current flow through an inductor stops, the inductor resists that change. The current flow is sustained by the inductor by the electric polarity of the inductor swapping ends. That current flow then charges the opposite side of the capacitor. Rinse and repeat. Here's the conversation between the capacitor (C) and inductor (L): C: "I'm sending you my electric charge - here's current flow. Okay, you now have all my electric charge. I have stopped the current flow." L: "Thanks but you started the current flow - and now you're stopping it? I don't behave that way - the current has to keep moving. Sorry." At the moment the capacitor gives up and stops current flow, the energy is in the inductor magnetic field, and that keeps the current flowing. To anthropomorphize this, neither the capacitor nor the inductor want the energy. The capacitor tries to pass it off to the inductor. The inductor does not keep it, but passes it to the other side of the capacitor. The energy moving back and forth is like liver and onions - "I'm not eating it. YOU eat it." "No, you!" etc.

[@sean8688]

@GregChase I appreciate you replying to my 11 year old comment. Unfortunately, a bit late to help with my exam prep.

[@Greg_Chase]

@@sean8688 I hope you've done well in your career. After college and 3 years industry experience, I noticed all my software engineering friends made a lot more money ("the hardware is only built once, an infinite number of computer programs can go on the hardware") I went back to college and got a 2nd degree and made bank in startups. For all you EE types, it is a rewarding career, but the bulk of the work these days is in software. The other issue was the near-instant copying of hardware by china. Not so easy to do with software.

[@Debjit625]

Thanks for these videos they really helped me to clear my concept

[@yoramstein]

Hello lasseviren -The under page is about scanning probe for moving atoms -Nano technology- would love to see on KZbin a lectuur covers that area made by you.

[@snicks9497]

Thank you! Your'e energy explanation really helped me alot.

[@nuhriko]

perfectly depicting the Law of Energy Conservation. Thanks a lot for your great help. :)

[@bitbeak]

Thank you very much sir, concise and to the point

[@d0nkurai]

thank you so much

[@MrTheSlim]

Very helpful, thanks

[@andrewskyworker]

this is real good

[@vishaldad]

Thnx dude!

[@RasnaMantha]

your correct. I agree I think he made a mistake.

[@corlfranco9371]

(laplace that shit then reverse laplace it when u can)

[@karamathus]

i love the way you explain it is like injecting it to my brain, but taking a candy in your mouth while you are talking is a little it annoying, excuse me for that!