Questions tagged [self-induction]
23 questions
8
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4 answers
Why skin effect happens at the center of a conductor?
I was reading an article about Skin Effect. I know what skin effect is, but I wanted to know what causes it.
Why is the back EMF strongest at the center?
Why is it not distributed uniformly at the cross section area of the conductor? so that, the…
Michael George
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2 answers
Does the Commutator of a brushed DC motor cause inductive kickback
I'm new to electricity.
Textbooks on brushed DC motor talk about inductive kickback when we DISCONNECT the power supply from the motor (and the stuff to protect against it e.g. by adding a diode/snubber). While when a motor is operating, only back…
JavaMan
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5
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How does the inductor ''really'' induce voltage?
I'm trying to understand the concept but I can't find what I'm looking for. Sorry if I'm wrong at some points as it's the first time I'm studying these stuff.
I understand that when I have an RC circuit the electrons gather at the one plate of the…
John Katsantas
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3
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1 answer
What is polarity of self induced emf?
This is what i've drawn...assume that switch is working rapidly.the first figure shows the direction of magnetic field due to current from battery. Which is proper.but i get confused about second figure below it. Is it the correct polarity of self…
user133933
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2
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3 answers
Moving magnet frequency over a coil
It's my understanding that :
Changing magnetic field over a coil induce current in the coil itself.
Current running through a coil makes it magnetic. (To put it simply)
Can these 2 rules affect each other to reach a point of equilibrium, and if…
Charles-Ugo Brouillard
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1
vote
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What are overhang conductors?
I am asking this in the context of synchronous generators.
From the textbook "The Performance and Design of Alternating Current Machines", page 421, under the heading "3.Synchronous Reactance" of the CHAPTER XVII SYNCHRONOUS MACHINES:…
Awe Kumar Jha
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Is filtering useful here, and if so how to choose the value(s)?
Simple question of this project:
Is filtering useful here, and if so how to choose the value for L1/L2/L3 - especially L1?
simulate this circuit – Schematic created using CircuitLab
Context
This will be the output of the project. The idea is to…
user201301
1
vote
1 answer
Plasma damage to body cells
Can exposure to plasma or energy from Tesla home windings damage the body's cells?
More generally, will the plasma or energy from the Tesla coil ionize?
Merlin
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1
vote
2 answers
Why does the measured back-emf decrease when R is shorted in this circuit?
In the following circuit I move an iron rod back and forth inside a solenoid (represented by Rsol and Lsol) and measure voltage fluctuations across the terminals. I do this under two scenarios: with and without R shorted.
In each scenario, I adjust…
davegravy
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vote
1 answer
Why does the self-inductance of a straight wire decrease when its radius increase?
I made some research on the self-inductance of a straight wire, and many sources cited “Inductance Calculations” of F.W. Grover. So I read a bit of that book but I couldn't find the answer to my question.
As far as I know, the self-inductance is…
Tripola
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What is the recommended battery chemistry for digital multimeters?
I would like to know if the different internal resistances of different battery chemistry somehow affects the calibration of a digital multi-meter.
If so, then what would the optimal battery chemistry be for commercially available multimeters.
For…
Daniel Elefteriadis
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1 answer
How Armature reaction is different from Self inductance?
It was given in "Electric machinery Fundamentals" by Stephen J. Chapman book that Armature reaction and self inductance is different. Contribution from armature reaction is considered as voltage drop \$jXI_{A}\$, with reasoning that \$B_{stator}\$…
Wupadrasta Santosh
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1
vote
2 answers
Induced EMF in a transformer
In a transformer a sinusoidally varying voltage is applied to the primary coil of the transformer which give rise to a time varying flux which induce another sinusoidally varying EMF in the primary coil. The induced EMF has a 180° phase difference…
Siddharth Prakash
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Derivation of self-inductance of a long wire: Is my interpretation correct?
https://physics.stackexchange.com/questions/11799/derivation-of-self-inductance-of-a-long-wire
https://physics.stackexchange.com/questions/176783/flux-linkage-inside-of-a-conductor
https://physics.stackexchange.com/questions/734916/flux-linkage-insid…
İbrahim İpek
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1 answer
On Induction retardation
I'm an amateur/beginner, (maybe asking somewhat advanced questions) following a rather unorthodox learning curve, so please provide context if you can.
I'm curious about the retardation of the pick-up coil as a source of self (opposing) inductance,…
juanmf
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