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- Question
Three 47 Ω resistors are connected in parallel across a 110 volt source. The current drawn from the source is approximately
Options- A. 2.3 A
- B. 780 mA
- C. 47 mA
- D. 7.06 A
- Correct Answer
- 7.06 A
- 1. When an additional resistor is connected across an existing parallel circuit, the total resistance
Options- A. remains the same
- B. decreases by the value of the added resistor
- C. increases by the value of the added resistor
- D. decreases Discuss
- 2. In a five-branch parallel circuit, there are 12 mA of current in each branch. If one of the branches opens, the current in each of the other four branches is
Options- A. 48 mA
- B. 12 mA
- C. 0 A
- D. 3 mA Discuss
- 3. Three lights are connected in parallel across a 120 volt source. If one light burns out,
Options- A. the remaining two will glow dimmer
- B. the remaining two will glow brighter
- C. the remaining two will not light
- D. the remaining two will glow with the same brightness as before Discuss
- 4. Five 100 Ω resistors are connected in parallel. If one resistor is removed, the total resistance is
Options- A. 25 Ω
- B. 500 Ω
- C. 100 Ω
- D. 20 Ω Discuss
- 5. A 470 Ω resistor, a 220 Ω resistor, and a 100 Ω resistor are all in parallel. The total resistance is approximately
Options- A. 790 Ω
- B. 470 Ω
- C. 60 Ω
- D. 30 Ω Discuss
- 6. An ammeter has an internal resistance of 50 Ω. The meter movement itself can handle up to 1 mA. If 10 mA is applied to the meter, the shunt resistor, RSH1, is approximately
Options- A. 55 Ω
- B. 5.5 Ω
- C. 50 Ω
- D. 9 Ω Discuss
- 7. The following resistors are in parallel across a voltage source: 220 Ω, 470 Ω, and 560 Ω. The resistor with the least current is
Options- A. 220 Ω
- B. 470 Ω
- C. 560 Ω
- D. impossible to determine without knowing the voltage Discuss
- 8. The total resistance of a parallel circuit is 50 Ω. If the total current is 120 mA, the current through the 270 Ω resistor that makes up part of the parallel circuit is approximately
Options- A. 22 mA
- B. 120 mA
- C. 220 mA
- D. 50 mA Discuss
- 9. A set of Christmas tree lights is connected in parallel across a 110 V source. The filament of each light bulb is 1.8 kΩ. The current through each bulb is approximately
Options- A. 610 mA
- B. 18 mA
- C. 110 mA
- D. 61 mA Discuss
- 10. 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
Parallel Circuits problems
Search Results
Correct Answer: decreases
Correct Answer: 12 mA
Correct Answer: the remaining two will glow with the same brightness as before
Correct Answer: 25 Ω
Explanation:
1/R = 1/R1 + 1/R2 + 1/R3 + 1/R4 1/R = 1/100 + 1/100 + 100 + 1/100 1/R = 4/100 1/R = 1/25 Therefore R = 25 ohm.
Correct Answer: 60 Ω
Explanation:
1/R = (1/470 + 1/220 + 1/100)
R = 59.98 ohm
R = 59.98 ohm
Correct Answer: 5.5 Ω
Correct Answer: 560 Ω
Correct Answer: 22 mA
Correct Answer: 61 mA
Correct Answer: 72 W
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