Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [inductance]

Inductance is the property by which a change in current in a conductor induces a voltage both in the conductor itself and nearby inductors, the latter being the basis upon which transformers operate. Discrete inductors are also available that have many applications including filtering and energy storage.

667 questions
62
votes
3 answers

Is this video fake? I thought Tesla coils only worked on AC

This video shows a 9-volt battery connected to a wire as a primary. The first reason I think this is fake is that he is powering a Tesla coil with 10 volts. The second reason is that Tesla coils work on AC, or at least I thought so, and he wouldn't…
Gabriel ashmore
  • 691
  • 4
  • 7
43
votes
3 answers

Why don't typical digital multimeters measure inductance?

Even with predominantly digital circuits, I am using inductors much more often than I used to, generally because of all the buck or boost converters (a recent board I was involved in has 12 different voltage rails -- six of them needed just by the…
tcrosley
  • 47,708
  • 5
  • 97
  • 161
33
votes
2 answers

What is saturation in an inductor

I have heard a lot of the time that "the core is not large enough to handle the current, and will reach saturation". What is saturation and why is it a bad thing to reach saturation?
skyler
  • 10,136
  • 27
  • 80
  • 130
31
votes
3 answers

Why are lightbulbs considered resistive load?

A lightbulb (a plain old incandescent lamp) is typically brought up as an example of resistive load. Yet the filament is actually made of several feet of very thin wire cleverly coiled to form a filament which is about one inch long. Clearly…
sharptooth
  • 12,374
  • 26
  • 83
  • 144
24
votes
5 answers

What is killing my MOSFETs?

This is my first post here on electronics stackexchange. I am a hobbyits in electronics, and a professional in programming. I am working on a inductor circuit to heat a workpiece. I have a working setup @12VAC. In short I have the following elements…
Mike de Klerk
  • 541
  • 1
  • 4
  • 14
23
votes
1 answer

What is this squiggly trace for?

It's on pin 14, which is the master clock input (MCLK) of a WM8761: Low cost stereo DAC. I'm guessing it's meant to act as a small inductor? But why would you want that on a clock input?
endolith
  • 28,494
  • 23
  • 117
  • 181
21
votes
1 answer

What does the "L" in inductance stand for?

"R" is resistor/resistance, and "C" is capacitor/capacitance, that makes sense. But where comes the "L" for inductor/inductance come from? edit: Wikipedia says it's possibly in honor of Heinrich Lenz, but I'd like to hear something more affirmative.
Federico Russo
  • 9,658
  • 17
  • 68
  • 117
20
votes
2 answers

How do I use a transformer as an inductor?

Lp: Self inductance of the primary winding. Ls: Self inductance of the secondary winding. Lm: Mutual inductance between the primary and secondary windings. Assume that I need an iron core inductor with large inductance to use under 50Hz or…
hkBattousai
  • 13,913
  • 31
  • 114
  • 190
19
votes
7 answers

LC circuit, bigger L than C, or bigger C than L?

So if I want my LC circuit to resonate at 20MHz, I just use the formula, \$F=\frac{1} {2\pi\sqrt{LC}}\$. Using available inductor and capacitor values, there are lots of different possible combinations. If L is small, C is big or vice-versa. Or they…
griffin175
  • 431
  • 1
  • 4
  • 15
17
votes
4 answers

What does negative capacitance mean?

I see negative capacitance measuring electrolytic capacitor at high frequencies (40kHz). How should I interpret that? The device is LCR Meter Hantek 1832C. I failed to find anything about that in the manual.
max5555
  • 275
  • 2
  • 8
16
votes
3 answers

Why is inductance (L) proportional with turns-square (N²)?

We start from the Maxwell's Equation $$ \mathbf{\nabla} \times \mathbf{B} = \mu \mathbf{J} + \overbrace{\mu \epsilon \dfrac{\partial \mathbf{E}}{\partial t}}^0. $$ We take surface integration of both sides, for the surface (\$s\$) inside the mean…
hkBattousai
  • 13,913
  • 31
  • 114
  • 190
15
votes
4 answers

How do I select the correct inductor value for the following buck regulator?

First of all, I suck a bit at math, and I'm no electronics genius, so the stuff I do is for fun and for learning purposes... I'm working on a buck converter circuit to convert my USB Vbus 5V to 3.3V. I've selected the AP5100 and finding it quite…
josef.van.niekerk
  • 3,600
  • 7
  • 44
  • 63
15
votes
5 answers

PCB Trace Layout to Minimize Inductance

I was wondering what the intuition was behind widening PCB traces to minimize the inductance between a trace and its ground plane. Many high speed design guides cite this without providing much of an explanation. Shouldn't the loop area between a…
wubzorz
  • 165
  • 1
  • 1
  • 8
14
votes
2 answers

If I used the primary coil as an inductor, does the secondary coil affect it?

I've read this question. It's about how to obtain the maximum inductance from a transformer: How do I use a transformer as an inductor? Now, I would like to use the primary coil only as an inductor to study some basics about inductors. I'm going to…
Michael George
  • 3,742
  • 13
  • 53
  • 84
13
votes
3 answers

What really causes series inductance of capacitors?

Doing some research in selecting capacitors for high frequency applications, concept of equivalent series inductance comes up a lot. Apparently all capacitors have this parasitic inductance which appears in series with the capacitance of the…
S. Rotos
  • 3,197
  • 2
  • 24
  • 48
1
2 3
…
44 45