Exercise: Parallel Circuits

Questions for: Parallel Circuits

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

R = 59.98 ohm
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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: B
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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: D
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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: C

10/(R/4) = 2 mA

40/R = 2 mA

R = 40/2 mA

= 40/0.002 A

= 20000 kohm (20 kohm)

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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: D
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