Circuits related questions and answers
1. An ammeter has an internal resistance of 50 Ω. The
meter movement itself can handle up to 1 mA. If 10 mA is
applied to the meter, the shunt resistor, RSH1, is
approximately
A. 55 Ω
B. 5.5 Ω
C. 50 Ω
D. 9 Ω
ANS : B
2. In a five-branch parallel circuit, there are 12 mA of
current in each branch. If one of the branches opens, the
current in each of the other four branches is
A. 48 mA
B. 12 mA
C. 0 A
D. 3 mA
ANS : B
3. 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
ANS : B
4. 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
ANS : D
5. When a 1.6 kΩ resistor and a 120Ω resistor are connected
in parallel, the total resistance is
A. greater than 1.6 kΩ
B. greater than 120 but less than 1.6 kΩ
C. less than 120 but greater than 100 Ω
D. less than 100 Ω
ANS : C
6. 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
ANS : B
7. 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
ANS : D
8. 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 Ω
B. 200 Ω
C. 20 KΩ
D. 50 Ω
ANS : C
9. 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
ANS : D
10. 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
ANS : B
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