Exercise: Parallel Circuits

Questions for: Parallel Circuits

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: B
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When a 1.6 k resistor and a 120 resistor are connected in parallel, the total resistance is
A:
greater than 1.6 k
B:
greater than 120 but less than 1.6 k
C:
less than 120 but greater than 100
D:
less than 100
Answer: C
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When an additional resistor is connected across an existing parallel circuit, the total resistance
A:
remains the same
B:
decreases by the value of the added resistor
C:
increases by the value of the added resistor
D:
decreases
Answer: D
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The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is
A:
1 A
B:
7 A
C:
unknown
D:
the larger of the two
Answer: B
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The total resistance of a parallel circuit is 50 . If the total current is 120 mA, the current through the 270 resistor that makes up part of the parallel circuit is approximately
A:
22 mA
B:
120 mA
C:
220 mA
D:
50 mA
Answer: A
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