Parallel Circuits problems
- 1. Four 8 Ω speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers is 12 V, the amplifier must be able to deliver to the speakers
Options- A. 18 W
- B. 1.5 W
- C. 48 W
- D. 72 W Discuss
Correct Answer: 72 W
- 2. Four resistors of equal value are connected in parallel. If the total voltage is 15 V and the total resistance is 600 Ω, the current through each parallel resistor is
Options- A. 25 mA
- B. 100 mA
- C. 6.25 mA
- D. 200 mA Discuss
Correct Answer: 6.25 mA
- 3. A sudden increase in the total current into a parallel circuit may indicate
Options- A. a drop in source voltage
- B. an open resistor
- C. an increase in source voltage
- D. either a drop in source voltage or an open resistor Discuss
Correct Answer: an increase in source voltage
- 4. Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2R, the third resistor 3R, and the fourth resistor 4R, the total current in the circuit is
Options- A. 60 mA
- B. 15 mA
- C. 135 mA
- D. 31.25 mA Discuss
Correct Answer: 31.25 mA
- 5. There is a total of 800 mA of current into four parallel resistors. The currents through three of the resistors are 40 mA, 70 mA, and 200 mA. The current through the fourth resistor is
Options- A. 490 mA
- B. 800 mA
- C. 310 mA
- D. 0 A Discuss
Correct Answer: 490 mA
- 6. The power dissipation in each of four parallel branches is 1.2 W. The total power dissipation is
Options- A. 1.2 W
- B. 4.8 W
- C. 0.3 W
- D. 12 W Discuss
Correct Answer: 4.8 W
- 7. 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 Discuss
Correct Answer: 20 KΩ
Explanation:
10/(R/4) = 2 mA
40/R = 2 mA
R = 40/2 mA
= 40/0.002 A
= 20000 kohm (20 kohm)
40/R = 2 mA
R = 40/2 mA
= 40/0.002 A
= 20000 kohm (20 kohm)
- 8. If one of the resistors in a parallel circuit is removed, the total resistance
Options- A. decreases
- B. increases
- C. remains the same
- D. doubles Discuss
Correct Answer: increases
- 9. When a 1.6 kΩ resistor and a 120 Ω resistor are connected in parallel, the total resistance is
Options- A. greater than 1.6 kΩ
- B. greater than 120 Ω but less than 1.6 kΩ
- C. less than 120 Ω but greater than 100 Ω
- D. less than 100 Ω Discuss
Correct Answer: less than 120 Ω but greater than 100 Ω
- 10. The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is
Options- A. 1 A
- B. 7 A
- C. unknown
- D. the larger of the two Discuss
Correct Answer: 7 A
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