Electrical Engineering - Parallel Circuits

Exercise :: Parallel Circuits - General Questions

16. 

In a certain three-branch parallel circuit, R1 has 12 mA through it, R2 has 15 mA through it, and R3 has 25 mA through it. After measuring a total of 27 mA, you can say that

A. R3 is open
B. R1 is open
C. R2 is open
D. the circuit is operating properly

Answer: Option A

Explanation:

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17. 

A sudden increase in the total current into a parallel circuit may indicate

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

Answer: Option C

Explanation:

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18. 

The following currents are measured in the same direction in a three-branch parallel circuit: 200 mA, 340 mA, and 700 mA. The value of the current into the junction of these branches is

A. 200 mA
B. 540 mA
C. 1.24 A
D. 900 mA

Answer: Option C

Explanation:

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19. 

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

A. 220
B. 470
C. 560
D. impossible to determine without knowing the voltage

Answer: Option C

Explanation:

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20. 

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

A. 2.3 A
B. 780 mA
C. 47 mA
D. 7.06 A

Answer: Option D

Explanation:

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