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Parallel Circuits

Study 25 Electrical Engineering MCQs with correct answers and explanations.

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11Electrical EngineeringMedium

Five 100 Ω resistors are connected in parallel. If one resistor is removed, the total resistance is________?

A25 Ω

B100 Ω

C20 Ω

D500 Ω

Correct answer

A. 25 Ω

Explanation

The correct answer is 25 Ω.

12Electrical EngineeringMedium

The following resistors are in parallel across a voltage source: 220Ω, 470Ω, and 560Ω. The resistor with the least current is________?

A560 Ω

B220 Ω

Cimpossible to determine without knowing the voltage

D470 Ω

Correct answer

A. 560 Ω

Explanation

The correct answer is 560 Ω.

13Electrical EngineeringMedium

Five light bulbs are connected in parallel across 110 V. Each bulb is rated at 200 W. The current through each bulb is approximately________?

A1.8 A

B137 mA

C9.09 A

D2.2 A

Correct answer

A. 1.8 A

Explanation

The correct answer is 1.8 A.

14Electrical EngineeringMedium

The power dissipation in each of four parallel branches is 1.2 W. The total power dissipation is________?

A4.8 W

B1.2 W

C12 W

D0.3 W

Correct answer

A. 4.8 W

Explanation

The correct answer is 4.8 W.

15Electrical EngineeringMedium

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________?

A7 A

Bunknown

Cthe larger of the two

D1 A

Correct answer

A. 7 A

Explanation

The correct answer is 7 A.

16Electrical EngineeringMedium

A set of Christmas tree lights is connected in parallel across a 110 V source. The filament of each light bulb is 1.8 k. The current through each bulb is approximately________?

A610 mA

B18 mA

C61 mA

D110 mA

Correct answer

C. 61 mA

Explanation

The correct answer is 61 mA.

17Electrical EngineeringMedium

The total resistance of a parallel circuit is 50 Ω. If the total current is 120 mA, the current through the 270 Ω that makes up part of the parallel circuit is approximately________?

A120 mA

B22 mA

C220 mA

D50 mA

Correct answer

B. 22 mA

Explanation

The correct answer is 22 mA.

18Electrical EngineeringMedium

Three 47 Ω resistors are connected in parallel across a 110 volt source. The current drawn from the source is approximately________?

A2.3 A

B47 mA

C780 mA

D7.06 A

Correct answer

D. 7.06 A

Explanation

The correct answer is 7.06 A.

19Electrical EngineeringMedium

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________?

A200 Ω

B20 KΩ

C50 Ω

D12.5 Ω

Correct answer

B. 20 KΩ

Explanation

The correct answer is 20 KΩ.

20Electrical EngineeringMedium

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________?

A490 mA

B800 mA

C0 A

D310 mA

Correct answer

A. 490 mA

Explanation

The correct answer is 490 mA.

11Electrical EngineeringMedium

Five 100 Ω resistors are connected in parallel. If one resistor is removed, the total resistance is________?

A25 Ω

B100 Ω

C20 Ω

D500 Ω

Correct answer

A. 25 Ω

Explanation

The correct answer is 25 Ω.

12Electrical EngineeringMedium

The following resistors are in parallel across a voltage source: 220Ω, 470Ω, and 560Ω. The resistor with the least current is________?

A560 Ω

B220 Ω

Cimpossible to determine without knowing the voltage

D470 Ω

Correct answer

A. 560 Ω

Explanation

The correct answer is 560 Ω.

13Electrical EngineeringMedium

Five light bulbs are connected in parallel across 110 V. Each bulb is rated at 200 W. The current through each bulb is approximately________?

A1.8 A

B137 mA

C9.09 A

D2.2 A

Correct answer

A. 1.8 A

Explanation

The correct answer is 1.8 A.

14Electrical EngineeringMedium

The power dissipation in each of four parallel branches is 1.2 W. The total power dissipation is________?

A4.8 W

B1.2 W

C12 W

D0.3 W

Correct answer

A. 4.8 W

Explanation

The correct answer is 4.8 W.

15Electrical EngineeringMedium

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________?

A7 A

Bunknown

Cthe larger of the two

D1 A

Correct answer

A. 7 A

Explanation

The correct answer is 7 A.

16Electrical EngineeringMedium

A set of Christmas tree lights is connected in parallel across a 110 V source. The filament of each light bulb is 1.8 k. The current through each bulb is approximately________?

A610 mA

B18 mA

C61 mA

D110 mA

Correct answer

C. 61 mA

Explanation

The correct answer is 61 mA.

17Electrical EngineeringMedium

The total resistance of a parallel circuit is 50 Ω. If the total current is 120 mA, the current through the 270 Ω that makes up part of the parallel circuit is approximately________?

A120 mA

B22 mA

C220 mA

D50 mA

Correct answer

B. 22 mA

Explanation

The correct answer is 22 mA.

18Electrical EngineeringMedium

Three 47 Ω resistors are connected in parallel across a 110 volt source. The current drawn from the source is approximately________?

A2.3 A

B47 mA

C780 mA

D7.06 A

Correct answer

D. 7.06 A

Explanation

The correct answer is 7.06 A.

19Electrical EngineeringMedium

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________?

A200 Ω

B20 KΩ

C50 Ω

D12.5 Ω

Correct answer

B. 20 KΩ

Explanation

The correct answer is 20 KΩ.

20Electrical EngineeringMedium

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________?

A490 mA

B800 mA

C0 A

D310 mA

Correct answer

A. 490 mA

Explanation

The correct answer is 490 mA.