Exercise: Parallel Circuits

Questions for: Parallel Circuits

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: A
No answer description is available. Let's discuss.
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: D
No answer description is available. Let's discuss.
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: A
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.
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: C
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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: C
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