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- Question
A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 kΩ. Current flow in the circuit is
Options- A. 9.2 mA
- B. 92 mA
- C. 4.6 mA
- D. 460 mA
- Correct Answer
- 4.6 mA
- 1. What is the angular difference between +j4 and ?j4?
Options- A. 30°
- B. 90°
- C. 180°
- D. 270° Discuss
- 2. A 6 kHz sinusoidal voltage is applied to a series RC circuit. The frequency of the voltage across the resistor is
Options- A. 0 Hz
- B. 12 kHz
- C. 6 kHz
- D. 18 kHz Discuss
- 3. For a certain load, the true power is 150 W and the reactive power is 125 VAR. The apparent power is
Options- A. 19.52 W
- B. 195.2 W
- C. 275 W
- D. 25 W Discuss
- 4. A 47 Ω resistor and a capacitor with a capacitive reactance of 120 Ω are in series across an ac source. What is the circuit impedance, Z?
Options- A. 129 Ω
- B. 12.9 Ω
- C. 167 Ω
- D. 73 Ω Discuss
- 5. The complex number 6 + j6 is equivalent to
Options- A. 6∠45°
- B. 36∠45°
- C. 8.48∠45°
- D. 8.48∠90° Discuss
- 6. When the frequency of the voltage applied to a series RC circuit is decreased, the impedance
Options- A. increases
- B. decreases
- C. remains the same
- D. doubles Discuss
- 7. In a parallel RC circuit, there is 100 mA through the resistive branch and 100 mA through the capacitive branch. The total rms current is
Options- A. 200 mA
- B. 100 mA
- C. 282 mA
- D. 141 mA Discuss
- 8. A positive angle of 30° is equivalent to a negative angle of
Options- A. ?30°
- B. ?330°
- C. ?60°
- D. ?180° Discuss
- 9. In the complex plane, the number 4 + j3 is located in the
Options- A. first quadrant
- B. second quadrant
- C. third quadrant
- D. fourth quadrant Discuss
- 10. A 12 kΩ resistor is in series with a 0.02 µF capacitor across a 1.2 kHz ac source. If the current is expressed in polar form as I = 0.3∠0° mA, what is the source voltage expressed in polar form?
Options- A. 45.6 V
- B. 411.3 V
- C. 0.411 V
- D. 4.11 V Discuss
RC Circuits problems
Search Results
Correct Answer: 180°
Correct Answer: 6 kHz
Correct Answer: 195.2 W
Correct Answer: 129 Ω
Correct Answer: 8.48∠45°
Correct Answer: increases
Correct Answer: 141 mA
Correct Answer: ?330°
Correct Answer: first quadrant
Correct Answer: 4.11 V
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