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.

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How to wind a toroid for 170 uH Inductor

I am planning on buying a toroid core from Digi-Key. I want to be sure that this is the right type and that I can achieve 170 uh inductance with 22-18 AWG wire. How can I wind this and what is the formula so I can calculate this myself in the…
skyler
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Coil Area vs Core Area

Most inductance formulas seem to assume that the COIL cross sectional area is the same as the CORE cross sectional area. Many times, the coil is wound on a bobbin which slides over the core. In this case the core area is slightly less than the…
crj11
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Measurement of an inductor not accurate at all

I'm trying out a method of measuring the inductance of inductors with a following circuit: I'm using a signal generator to create the input voltage, and an oscilloscope to read the output across both the resistor and the inductor, as well as across…
S. Rotos
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What is partial inductance?

Some background I have simplified understanding of inductance which is incorrect yet has been a useful falsehood so far. The idea is that a changing flow of current through a loop creates magnetic flux through the area of the loop and the change in…
jleahy
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Is self inductance and leakage inductance the same thing?

I want to intuitively understand what they are and if they are the same thing.
CKCK
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The physical meaning of inductance

What is the the physical meaning of inductance? We know that the resistance "R" of a conductor is how easily the electrons flow through it, etc., but what about the inductance "X"?
Abdu
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Understanding inductors with non closed/looping iron cores

Toroid inductors make sense to me. The magnetic circuit is closed. However, I do not understand inductors that just have a magnetic core in the center (like this one): Considering that the inductance for an inductor with an air gap is: If the air…
easox
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Determining the coil inductance of a relay when the relay is on

I'm trying to measure the coil inductance of a relay when the relay is on and the normally open pairs of contacts are closed. The relay has a rated AC voltage of 110V and a rated current of 21mA. I know that \$V = L\dfrac{di}{dt}\$, but I'm not…
D Brown
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inductance wiretap

I am trying to create a wire-tap for ethernet cables by modifying a classic phone wiretap which uses inductance. I haven't studied this in quite some time and need to come up with a solution for a course project. I have tested the wire-tap on…
user26119
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What is an Evaluation Board used for?

I am currently working on a senior design project. I have always been a software person, but it seems that this project requires quite a bit of hardware knowledge. We are trying to measure respiratory rate using respiratory inductive…
Nathan
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What is the inverse of the inductance?

That's for a homework. I'm asking what is 1/L, where L is inductance? I mean, as the inverse of the resistance is conductance, what is the inverse of the inductance.
Sebastian Valencia
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A question about inductive kick and the current voltage equation

In the book The Art of Electronics the author writes the following when trying to explain the inductive kick: And then he mentions when the switch is opened abruptly, the inductor tries to keep current flowing and damages the switch if no flyback…
user1245
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LCR meter and iron core inductors

I am trying to wind some coils for a RF transmitter, so to get the values right, I though of using a LCR meter, but there is a problem with the measurements. If I use air core inductors the measured values don't differ that much when switching from…
Golaž
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How to identify mutual inductance?

I have two coils covered in a box and I don't know the physical arrangement of the two coils and mode of each winding in a magnetically couple DC circuit. How can I make an experiment to determine the dot convention of the two coils?
T.Nhan
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How do I calculate the inductance value of an inductor in an LR circuit given input voltage, resistance and dI/dT at the moment a switch is closed?

I have been working at this problem for a while. simulate this circuit – Schematic created using CircuitLab Given the values of V1 and R1, plus the fact that at the instant SW1 is closed the rate of change of I is approx. 45 A/s, how do I calculate…
Electron-Capture
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