About Inductors

138

01:16:34

The function of an inductor is to resist change in voltage. Inductance is measured in Henries  (nH, uH, mH, H, kH and so on). When Current changes in an inductor, a magnetic field is produced. This forces electrons to move in the opposite direction. In conjunction with a capacitor, it is called an LC oscillator.

published 5 years ago

eekee

5 years ago

It resists changes in current rather than voltage. (Voltage is just the pressure making the current flow.) Capacitors resist continuous current, it's interesting how neatly they mirror inductors.

giomix

5 years ago

Wow, kH ... never seen inductor more than some Henry in reality..

jason9

5 years ago

Actually the permeability of empty space (vacuum) is 4π*10^(-7) H/m (Henries per meter) meaning the distance from here to the sun is 94kH (no idea how that makes any sense, but it does in some context or other). Perhaps two wires 1 meter apart going from here to the sun connected at the ends to make a loop will have an inductance of 94kH? I dunno.

fatcat2

5 years ago

But with a superconductive coil of diameter 1mm and area 1cm^2, we can get an inductance of several megahenries!

jason9

5 years ago

Just a single loop? That doesn’t sound right. And why does it need to be a superconductor? Why not just a copper wire? Should work just as well as long as the current is kept low. If this is the case, then any tiny loop of copper will have obscene inductances which clearly isn’t the case. Or do you mean the coil is as many loops as it takes to be as tall as the distance from here to the sun? If so, then that makes sense.

fatcat2

5 years ago

Yeah; it's the latter case that I meant. 'Coil' means multiple turns, right? Since the thickness is so less, the quality factor will be very low if we use Cu. Resistance doesn't affect the inductance; I just wanted a good quality factor :D. An ideal coil of diameter 1mm and area 1cm^2 extending all the way to the sun's surface would have an inductance of approx. 19MH, humongous.

jason9

5 years ago

Well yeah, of course. It’s a looooooooooooooooooooooooooooooooooo... (10^11 more o’s) ... ooooooooooooooooooooooooooooooooooooong distance. No surprise it’s in the MH range.

jason9

5 years ago

And yeah I did derp there about coil vs loop.

fatcat2

5 years ago

Fine

ShyScum

5 years ago

Inductors resist change in current and capacitor resist change in voltage

fatcat2

5 years ago

Nada! Prove me wrong if you can 😉

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