All Questions
Tagged with capacitor circuit-theory
8 questions
0
votes
4
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143
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Are voltage ratings defined differently for capacitors and light bulbs?
The voltage rating of a capacitor is the maximum operating voltage, while the voltage rating of a light bulb is its normal operating voltage. Are there two different definitions of voltage ratings, or ...
- 270
2
votes
2
answers
121
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Why losslessness requires voltage and current must be both zero?
In the textbook (pg. 260 Linear Circuit Analysis, by Artice Davis), losslessness is defined in such way:
Losslessness: If w(\$\infty\$) = 0 for any v(t) and i(t) waveforms supported by the
element ...
- 1,448
1
vote
1
answer
2k
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Capacitor sign convention
I am a lot confused about how to assign the current of a capacitor and the sign of its constitutive relation, because usually in physics and in engineering there are different conventions. There are ...
- 3,590
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1
answer
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Current going into the positive pole of a battery while discharging a capacitor
Please bear with me if this is a fundamental question.
Let's suppose we have an RC circuit, charging a capacitor up to the voltage of a battery of 9V. The capacitor is currently at 9V, we switch the ...
- 341
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3
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1k
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How does one relate an RC circuit's time domain solution to phasors?
It seems to be a given for phasor analysis that the voltage across a capacitor can be defined as follows:
$$ V_{C}(t) = V_{A}\cos(\omega t + \phi)\tag{1} $$
Where Vc(t) is the capacitor's voltage at ...
- 572
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votes
2
answers
221
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What are the initial conditions used to find the coefficients in the current equations?
Suppose a RLC series circuit. R, L and C are in series with a battery and a switch. The switch is open. L and C are discharged.
At t=0, the switch is closed and the battery (V1) feeds the circuit.
I ...
- 847
0
votes
1
answer
574
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How do I find the current equations for the RLC Series Circuit?
Let's talk about a RLC series circuit. R, L and C are in series with a battery and a switch. The switch is open. L and C are discharged.
At t=0, the switch is closed and the battery (V1) feeds the ...
- 847
2
votes
2
answers
9k
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First order circuit with t=0+ , t=0-?
Yesterday I tried to solve a question in a second order circuit , but I couldn't ! because I have problem understanding the concept of 0+ , 0- !
So let me try it in a first order circuit , it ...
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