Electrical Engineering - Parallel Circuits

Exercise :: Parallel Circuits - General Questions

11. 

A 470 resistor, a 220 resistor, and a 100 resistor are all in parallel. The total resistance is approximately

A. 790
B. 470
C. 60
D. 30

Answer: Option C

Explanation:

1/R = (1/470 + 1/220 + 1/100)

R = 59.98 ohm

12. 

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

A. 2.2 A
B. 137 mA
C. 1.8 A
D. 9.09 A

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

13. 

Four resistors of equal value are connected in parallel. If the total voltage is 15 V and the total resistance is 600 , the current through each parallel resistor is

A. 25 mA
B. 100 mA
C. 6.25 mA
D. 200 mA

Answer: Option C

Explanation:

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14. 

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

A. 25
B. 500
C. 100
D. 20

Answer: Option A

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.

15. 

Four 8 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

A. 18 W
B. 1.5 W
C. 48 W
D. 72 W

Answer: Option D

Explanation:

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