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A fundamental electronic component that stores energy in an electric field, commonly used in filtering applications.
1
vote
Accepted
Capacitor charging/discharging waveform confusion
The 22.5ms label is wrong, but the rest of the graph is right. There's equal horizontal spacing between 0ms, 5ms, 10ms, and 15ms, with about half as much space between 15ms and the final +5τ' tick. Th …
4
votes
Accepted
What does a capacitor “Series” signifies?
It should tell you how to construct a part number for a specific capacitor. …
1
vote
Voltage and current after closing the switch
You need an initial state for the 1 F capacitor. And you can't just short together two capacitors at different voltages. That would imply infinite current and violate conservation of energy. …
7
votes
Accepted
Understanding The Art of Electronics mathematical explanation for capacitors
The capacitor acts like a short to ground, so the current is \$V_i/R\$. After a long time, the voltage has stabilized and we effectively have a DC circuit. … The capacitor acts like an open circuit, so \$V = V_i\$ and no current flows.
The transition between these two states in an exponential decay. …
2
votes
Accepted
How does a capactior reduce voltage ripples
To see this more clearly, imagine removing the load and leaving only the capacitor and the diode rectifier. As the AC voltage rises, it charges the capacitor through the diodes. … At the peak of the AC half-cycle, the AC voltage becomes greater than the capacitor voltage. The diodes turn on and the AC source charges the capacitor back to its maximum value. …
1
vote
Will a capacitor do the trick?
The capacitor might be rated for exposure to AC, but you can't "store" AC power in a capacitor. Even if you somehow could, 1.14uF is orders of magnitude too small. …
0
votes
Thevenin Equivalent of RC circuit
You're on the right track, but your formula is wrong. R1 and R2 are in parallel, so you need to use the formula for combining parallel resistors to get the Thevenin resistance.
1
vote
Accepted
Figuring out the importance of each component in a circuit
D1 protects the circuit if the voltage supply is connected backwards. C3 reduces voltage ripple from the supply; giving a quieter DC voltage source for the rest of the circuit.
Diodes do not prevent o …
0
votes
LM317, basic voltage regulator, why does it get hot when not connected?
It's common to put a 0.1uF capacitor close to the chip to provide a low-inductance power supply. In this role, the capacitors are called "bypass capacitors". …
0
votes
Negative current through capacitor on multisim simulation
If the capacitor and voltage source are modeled as ideal, you probably shouldn't have a switch in the circuit. Discontinuities in capacitor voltage are not allowed. …
0
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Is there a significant loss in a voltage doubler circuit?
It sounds like you want to do three things:
Connect each generator coil to one capacitor.
Connect the two capacitors to each other in series.
Not connect the generator coils to each other. …
4
votes
Accepted
A few questions about basic capacitor concepts
To the rest of the circuit, it looks like there's a current through the capacitor, since electrons go into one end and come out the other. … If you replace the battery with an open circuit, no current flows and the capacitor remains charged. …
3
votes
Why does capacitor voltage lag current?
To get the voltage to start rising, you need to be pumping charge onto the plates of the capacitor. I think you're trying to apply DC thinking to an AC circuit. … It's what really matters to the capacitor. …
1
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What does really happen when you connect a capacitor in DC series?
But from the outside, we see charge moving into one side of the capacitor and moving out of the other side. So in circuit theory we pretend that current is flowing "through" the capacitor. …
8
votes
Accepted
Why is the load voltage greater than the supply voltage in an AC circuit?
The resistor and capacitor voltages are out of phase. Their peak values don't happen at the same time. … For a 1 microfarad capacitor at 55 Hz, this gives:
$$X_C = \frac 1 {j 2 \pi (55\ \mathrm{Hz} \cdot 1\ \mathrm {\mu F})} = -j2.89\ \mathrm{k\Omega}$$
To find the voltage across the capacitor, use your …