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# Electronics - Capacitors

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### Exercise

"Time and tide wait for none."
- Alexander Pope
1.

In a 20 Vac series RC circuit, if 20 V is measured across the resistor and 40 V is measured across the capacitor, the applied voltage is:

 A. 45 V B. 50 V C. 55 V D. 60 V

2.

Select the equation below that represents the relationship between charge, capacitance, and voltage for a capacitor.

 A. Q = CV B. C = QV C. D. V = IR

3.

When is a capacitor fully charged?

 A. when the voltage across its plates is of the voltage from ground to one of its plates B. when the current through the capacitor is the same as when the capacitor is discharged C. when the voltage across the plates is 0.707 of the input voltage D. when the current through the capacitor is directly proportional to the area of the plates

4.

What is the reactive power in the given circuit?

 A. 0 VAR B. 691 VAR C. 44.23 mVAR D. 1.45 kVAR

5.

What is the angle theta value for a 5.6 F capacitor and a 50-ohm resistor in series with a 1.1 kHz, 5 Vac source?

 A. 27.3 degrees B. 62.7 degrees C. –27.3 degrees D. –62.7 degrees