All Questions
Tagged with energy electromagnetism
15
questions
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133
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Time average stored electric energy in a volume
I am studying the book Microwave Engineering Third Edition by David M. Pozar. At the moment I am at chapter 1.6. At the beginning of this chapter Pozar states that
In the sinusoidal steady-state case,...
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5
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4
answers
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Could a very high voltage and very low current allow a non-superconducting magnetic energy storage system?
A very low current with very high voltage can travel through high resistant wires without much loss. Could this type of current be used on magnetic energy storage without superconducting materials?
...
- 370
4
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3
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1k
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Understanding the flux linkage in transformers
I am having difficulty understanding the concept of flux linkage in transformers, particularly how the secondary winding receives its flux when all the flux is said to be confined to the iron core. I ...
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2
answers
141
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How can energy be stored in a magnetic field?
A magnetic field can be thought of a vector field of force on electrons. Basically this can be thought of a some area that attracts or repels electrons.
It is said that inductors are able to "...
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6
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1
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668
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What role do electrons play in a circuit other than establishing an electric field?
In a simple electric circuit consisting of a load (such as a filament lamp) and a power source (a 5 V battery), when the switch is turned on the electrons experience a "displacement" which ...
- 203
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227
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Do kinetic energy and inductor energy violate conservation of energy?
I posted this question on the physics page. I feel like it might be better suited to this site, though.
Suppose we have an ideal LC circuit (no resistance) and an open switch where the capacitor has ...
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4
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155
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Energy Transport in Circuits
I've been reading about how energy is actually transported in circuits (I first read about it here: http://amasci.com/miscon/ener1.html). The description in this article of why electrons don't move ...
- 675
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2
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How many watts does a 40 MHz radio frequency signal create?
I am new to the study of electromagnetic frequencies and electrical engineering as a whole.
I am trying to understand how to convert a radio frequency into energy, or calculate the power density of ...
- 135
33
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6
answers
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What is the speed of "electricity"?
In a distribution grid, what is the speed of
energy
signal
Is it strictly the same?
And how is synchronisation achieved? Is an electric grid essentially an orchestra where everyone is the chief ...
- 531
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1
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184
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If counter-emf is zero, why is COE violated?
I've been modeling this thought experiment a for a while now:
If in a electromagnetic system, the induced emf wasn't opposing the change, but increasing it, we're getting energy from nowhere, that ...
- 3
0
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2
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225
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Energies carried by electric and magnetic fields in plane waves
This is a newbie question. I'm trying to understand what I think must be a very basic concept with an obvious answer, but I want to be sure.
Do plane wave electric and magnetic fields of equal ...
- 321
0
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1
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2k
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Design of permanent magnet generator
I had taken this video as a reference to make my own permanent magnet generator: Permanent magnet generator. However, I am not able to understand how the copper coils are wound and outputted.
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1
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1
answer
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How to calculate energy transfer in inductive heating?
I designed an inductance heater. Its inductor is calculated 50 uH as below:
And I draw 9.4 A AC current at 33 Khz of it.
But, I want to know how to calculate the transferred energy to the working ...
- 1,313
0
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1
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146
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Range of Electromagnetic Waves/Radio waves? [closed]
What basically determines that how far the electromagnetic waves will travel away from the source ? In our world where there is air and other materials how electromagnetic waves would generally ...
- 1,498
4
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3
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279
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A few questions regarding B/E-fields in practical circuitry
I have been trying a few learning resources to help unlearn some of the notions that electrons flow through as energy.
Chiefly this resource is what I have used:
Amasci - IN A SIMPLE CIRCUIT, WHERE ...
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