RC Circuits — Engineering Board Exam Practice Questions

25 free engineering board exam reviewer questions on RC Circuits (AC Circuits), each with the correct answer and a worked solution.

1. In a series RC circuit the capacitor voltage is twice the resistor voltage. If the source is 100 V rms, find the voltage across the…
2. A resistor and a capacitor in series draw 4 A from a 240 V, 50 Hz source, and the current leads the voltage by 30°. Find the capacitance.
3. A series RC circuit has R=1.5 k and C=0.1, F. At what frequency is the phase angle between the source voltage and current 45°?
4. In the series-parallel RC circuit shown, a 200 V (rms) source with =2000 rad/s drives R1=15, , R2=120, , and C=12.5, F. Resistor R2 is in…
5. In the series-parallel RC circuit shown, a 150 V (rms) source with =2000 rad/s drives R1=45, , R2=150, , and C=10, F. Resistor R2 is in…
6. In a series RC circuit, the capacitor voltage VC compared with the resistor voltage VR
7. A series RC circuit has R=60, and XC=80, . What is its power factor?
8. In a series RC circuit, the voltage across the resistor is 30 V and the voltage across the capacitor is 40 V. What is the source voltage?
9. A 100, resistor and a 22, F capacitor are connected in series across a 120 V, 60 Hz source. Find the current.
10. A 1 k resistor and a 0.1, F capacitor are connected in series across a 1 kHz source. Find the magnitude of the total impedance.
11. In the parallel RC circuit shown, a 480 V (rms) source with =10000 rad/s feeds R=48, and C=5, F in parallel. By how many degrees does the…
12. In the parallel RC circuit shown, a 96 V (rms) source with =10000 rad/s feeds R=6, and C=12.5, F in parallel. Find the magnitude of the…
13. In the parallel RC circuit shown, a 120 V (rms) source with =10000 rad/s feeds R=12, and C=20, F in parallel. Find the total current drawn…
14. In the series RC circuit shown, a 340 V (rms) source with =5000 rad/s is connected to R=150, and C=2.5, F. Find the apparent power…
15. In the series RC circuit shown, a 255 V (rms) source with =2000 rad/s is connected to R=150, and C=6.25, F. Find the real power dissipated…
16. In the series RC circuit shown, a 50 V (rms) source with =10000 rad/s is connected to R=12, and C=6.25, F. By how many degrees does the…
17. In the series RC circuit shown, a 75 V (rms) source with =500 rad/s is connected to R=15, and C=100, F. Find the voltage across the…
18. In the series RC circuit shown, a 85 V (rms) source with =2000 rad/s is connected to R=75, and C=12.5, F. Find the voltage across the…
19. In the series RC circuit shown, a 232 V (rms) source with =5000 rad/s is connected to R=84, and C=2.5, F. Find the current drawn from the…
20. Find the capacitive reactance of a 47, F capacitor connected to a 60 Hz source.
21. If the source frequency of a series RC circuit is doubled while R and C are unchanged, the capacitive reactance
22. What is the capacitive reactance of a 0.1, F capacitor at 1 kHz?
23. In a purely capacitive ac circuit, the current
24. In the parallel RC circuit shown, a 360 V (rms) source with =2000 rad/s feeds R=15, and C=25, F in parallel. Find the current in the…
25. In the series RC circuit shown, a 40 V (rms) source with =5000 rad/s is connected to R=12, and C=12.5, F. Find the magnitude of the total…