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Electrical Engineering
Parallel Circuits
Quiz 1
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Q.1
The sum of the currents into a junction is equal to the sum of the currents out of that junction.
True
False
Q.2
Total power in a parallel circuit is found by adding up the power of all the individual resistors.
True
False
Q.3
Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2R, the third resistor 3R, and the fourth resistor 4R, the total current in the circuit is
60 mA
15 mA
135 mA
31.25 mA
Q.4
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
55 Ω
5.5 Ω
50 Ω
9 Ω
Q.5
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
48 mA
12 mA
0 A
3 mA
Q.6
There is a total of 800 mA of current into four parallel resistors. The currents through three of the resistors are 40 mA, 70 mA, and 200 mA. The current through the fourth resistor is
490 mA
800 mA
310 mA
0 A
Q.7
The total current divides among parallel resistors in a manner directly proportional to the resistance values.
True
False
Q.8
Six resistors are in parallel. The two lowest-value resistors are both 1.2 kΩ. The total resistance
Is less than 6 kΩ
Is greater than 1.2 kΩ
Is less than 1.2 kΩ
Is less than 600 Ω
Q.9
The total resistance of a parallel circuit is 50 Ω. If the total current is 120 mA, the current through the 270 Ω resistor that makes up part of the parallel circuit is approximately
22 mA
120 mA
220 mA
50 mA
Q.10
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
1 A
7 A
Unknown
The larger of the two
Q.11
The following resistors are in parallel across a voltage source: 220 Ω, 470 Ω, and 560 Ω. The resistor with the least current is
220 Ω
470 Ω
560 Ω
Impossible to determine without knowing the voltage
Q.12
The power dissipation in each of four parallel branches is 1.2 W. The total power dissipation is
1.2 W
4.8 W
0.3 W
12 W
Q.13
Three 47 Ω resistors are connected in parallel across a 110 volt source. The current drawn from the source is approximately
2.3 A
780 mA
47 mA
7.06 A
Q.14
The following currents are measured in the same direction in a three-branch parallel circuit: 200 mA, 340 mA, and 700 mA. The value of the current into the junction of these branches is
200 mA
540 mA
1.24 A
900 mA
Q.15
Three lights are connected in parallel across a 120 volt source. If one light burns out,
The remaining two will glow dimmer
The remaining two will glow brighter
The remaining two will not light
The remaining two will glow with the same brightness as before
Q.16
Four resistors of equal value are connected in parallel. If the total voltage is 15 V and the total resistance is 600 Ω, the current through each parallel resistor is
25 mA
100 mA
6.25 mA
200 mA
Q.17
Four 8 Ω 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
18 W
1.5 W
48 W
72 W
Q.18
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
R3 is open
R1 is open
R2 is open
The circuit is operating properly
Q.19
Addition of resistors in parallel increases total resistance and decreases total current.
True
False
Q.20
When an open circuit occurs in a parallel branch, the total resistance decreases.
True
False
Q.21
The total resistance for two resistors in parallel is equal to the sum of the two resistors.
True
False
Q.22
A set of Christmas tree lights is connected in parallel across a 110 V source. The filament of each light bulb is 1.8 kΩ. The current through each bulb is approximately
610 mA
18 mA
110 mA
61 mA
Q.23
Five light bulbs are connected in parallel across 110 V. Each bulb is rated at 200 W. The current through each bulb is approximately
2.2 A
137 mA
1.8 A
9.09 A
Q.24
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
610 mA
18 mA
110 mA
61 mA
Q.25
Parallel resistors are connected between the same two points.
True
False
Q.26
When an additional resistor is connected across an existing parallel circuit, the total resistance
Remains the same
Decreases by the value of the added resistor
Increases by the value of the added resistor
Decreases
Q.27
If one of the resistors in a parallel circuit is removed, the total resistance
Decreases
Increases
Remains the same
Doubles
Q.28
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
50 mA
70 mA
120 mA
40 mA
Q.29
A parallel circuit acts as a current divider.
True
False
Q.30
The number of current paths equals the number of resistors in parallel.
True
False
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