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- Question
Four equal-value resistors are connected in parallel. Ten volts are applied across the parallel circuit and 2 mA are measured from the source. The value of each resistor is
Options- A. 12.5 Ω
- B. 200 Ω
- C. 20 KΩ
- D. 50 Ω
- Correct Answer
- 20 KΩ
Explanation10/(R/4) = 2 mA
40/R = 2 mA
R = 40/2 mA
= 40/0.002 A
= 20000 kohm (20 kohm)
More questions
- 1. Three 15 mH inductors are in series. The total inductance is
Options- A. 15 mH
- B. 30 mH
- C. 45 mH
- D. 5 mH Discuss
Correct Answer: 45 mH
- 2. A parallel circuit acts as a current divider.
Options- A. True
- B. False Discuss
Correct Answer: True
- 3. A capacitor blocks ac but passes dc.
Options- A. True
- B. False Discuss
Correct Answer: False
- 4. Current is measured in
Options- A. watts
- B. volts
- C. henries
- D. amperes Discuss
Correct Answer: amperes
- 5. The number of kilowatts in 135 milliwatts is
Options- A. 1.35 × 10?4 kW
- B. 135 × 10?3 kW
- C. 0.0135 kW
- D. 0.00135 kW Discuss
Correct Answer: 1.35 × 10?4 kW
- 6. When the current through a 12 kΩ resistor is 8 mA, the power is
Options- A. 7.68 mW
- B. 768 mW
- C. 7.68 W
- D. 76.8 W Discuss
Correct Answer: 768 mW
- 7. In an RL circuit, part of the power is resistive and part is reactive.
Options- A. True
- B. False Discuss
Correct Answer: True
- 8. The inductance of an iron-core coil decreases if
Options- A. the number of turns is decreased
- B. the iron core is removed
- C. the length of the coil decreases
- D. none of the above Discuss
Correct Answer: the number of turns is decreased
- 9. A transformer with a 110 V primary has a 15:1 turns ratio. The load resistance, RL, is 120 Ω. What is the approximate voltage across the load?
Options- A. 7.3 V
- B. 73 V
- C. 88 V
- D. 880 V Discuss
Correct Answer: 7.3 V
- 10. A 220 Ω resistor is in series with a 2.2 µF capacitor. The time constant is
Options- A. 48 µs
- B. 480 µs
- C. 2.42 µs
- D. 24 µs Discuss
Correct Answer: 480 µs
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