All Questions
124
questions
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Self-induction of a simple wire/circuit
I've been working as an EE intern for the past 5 months and have been trying to wrap my head around a couple concepts.
Is the principle of self-inductance due to a circuit's inherent property of being ...
2
votes
1
answer
477
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How can I provide a solenoid with the current it needs to accelerate a ferrous projectile to a given velocity?
My question upon first glance looks quite elementary, however my specialisation in physics is not circuitry and such I am not sure of my calculations.
A little bit of background: I am trying to ...
- 103
1
vote
1
answer
85
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AC current and voltage in an Inductor
This is the simulation of a RL circuit with an AC source.
That AC source is connected with the circuit at the moment when the source voltage has zero phase angle with 5 volts peak.
It can be seen ...
- 1,441
2
votes
2
answers
147
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How can be current increased with decreasing voltage?
Here are the voltage and current shown for the primary winding of a transformer or an ideal inductor when the voltage is sinusodial.
My question is why the current is increasing when the voltage is ...
- 1,441
2
votes
1
answer
133
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Effect on phase angle due to resistance
When an ac voltage source is applied to a resistor, current and voltage are in phase in the circuit.
When an ac voltage is applied to a pure inductor, voltage leads the current in the circuit by 90 ...
- 1,441
0
votes
4
answers
632
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I'm worried about current in an inductor at $t=0$ when it is connected with a DC source
When I connect a dc battery to an ideal pure inductor i think the voltage across inductor should be infinity. Because the rate of change of current should be infinity.because in no time say in $0$ ...
- 1
1
vote
2
answers
144
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Inductor with ac supply
When an ac source is connected with an inductor we have a continuous change in voltage and current across the inductor.
According to farady and lenz law we will get an equal and opposite voltage ...
- 1,441
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votes
3
answers
518
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Phase difference between source voltage and inductor voltage
What will be the phase difference between the source voltage and the inductor voltage? Will the two voltages be in phase or will be out of phase. How much out of phase they will be?
Note that there ...
- 1,441
1
vote
3
answers
319
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Significance of sliding switch in a LR circuit
The following image and statement are from my textbook Concepts of Physics on the chapter "Electromagnetic Induction", topic 38.6 "Growth and decay of current in an LR circuit", ...
- 5,306
0
votes
0
answers
137
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Work done by induced electric field in an inductor
Let us say the current in a circuit is increasing at time t=0. This circuit has an inductor (current enters the inductor from left) which opposes this increase in current. I know that the inductor ...
- 405
2
votes
1
answer
153
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Quantization of a waveguide: he only has one of the two E.O.M in his Lagrangian. How can the quantization be correct?
I am following this reference, appendinx C and D, around page 61
The goal is to quantize electric of current of propagating wave in a waveguide.
Classical E.O.M:
We model a waveguide by a ...
- 1,450
1
vote
2
answers
110
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Transformers and basic inductor physics
1) Why does resistor reduce the lag in a RL circuit? I understand why current lags by 90° with the voltage across the inductor. (After watching this) But I don't understand why that lag, would be ...
- 455
0
votes
1
answer
335
views
AC voltage source applied to an Inductor
Suppose an ideal case where an ideal voltage source is connected to an ideal inductor with no resistance.
Everytime the voltage changes from the source the electric field in the circuit changes. The ...
- 1,441
0
votes
3
answers
230
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Conceptually understanding RL circuits
I'm struggling to conceptually understand the current-time profile of an RL circuit. Specifically, what causes the rate of change of current, $\frac{\partial i}{\partial t}$, to start off high when ...
- 108
0
votes
1
answer
471
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Mutual inductance circuit analysis
given the following circuit, I need to find $ I_1(t) $ and $ I_2(t) $
(forgive my microsoft paint skills ;) )
I've come up with a solution, and I wish to check with you if it is current or, ...
- 113