Parallel Circuits problems
- 1. 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
Correct Answer: 60 Ω
Explanation:
1/R = (1/470 + 1/220 + 1/100)
R = 59.98 ohm
R = 59.98 ohm
- 2. 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
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.
- 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
Correct Answer: the remaining two will glow with the same brightness as before
- 4. 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
Correct Answer: 12 mA
- 5. 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
Correct Answer: decreases
- 6. 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 Discuss
Correct Answer: 7.06 A
- 7. 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
Correct Answer: 5.5 Ω
- 8. 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
Correct Answer: 560 Ω
- 9. 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
Correct Answer: 22 mA
- 10. 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
Correct Answer: 61 mA
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