Electrical Engineering - Parallel Circuits

Exercise :: Parallel Circuits - General Questions

6. 

If there are a total of 120 mA into a parallel circuit consisting of three branches, and two of the branch currents are 40 mA and 10 mA, the third branch current is

A. 50 mA
B. 70 mA
C. 120 mA
D. 40 mA

Answer: Option B

Explanation:

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7. 

Three lights are connected in parallel across a 120 volt source. If one light burns out,

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

Answer: Option D

Explanation:

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8. 

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

A. 12.5
B. 200
C. 20 K
D. 50

Answer: Option C

Explanation:

10/(R/4) = 2 mA

40/R = 2 mA

R = 40/2 mA

= 40/0.002 A

= 20000 kohm (20 kohm)


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 k. The current through each bulb is approximately

A. 610 mA
B. 18 mA
C. 110 mA
D. 61 mA

Answer: Option D

Explanation:

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10. 

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

A. 1.2 W
B. 4.8 W
C. 0.3 W
D. 12 W

Answer: Option B

Explanation:

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