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Electrical Engineering
Parallel Circuits
Quiz 4
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Q.1
The following resistors are in parallel across a voltage source:Ω,Ω, andΩ. The resistor with the least current is
220 Ω
470 Ω
560 Ω
Impossible to determine without knowing the voltage
Q.2
The number of current paths equals the number of resistors in parallel.
True
False
Q.3
A parallel circuit acts as a current divider.
True
False
Q.4
If there are a total ofmA into a parallel circuit consisting of three branches, and two of the branch currents aremA andmA, the third branch current is
50 mA
70 mA
120 mA
40 mA
Q.5
ThreeΩ resistors are connected in parallel across avolt source. The current drawn from the source is approximately
2.3 A
780 mA
47 mA
7.06 A
Q.6
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.7
Four resistors of equal value are connected in parallel. If the total voltage isV and the total resistance isΩ, the current through each parallel resistor is
25 mA
100 mA
6.25 mA
200 mA
Q.8
Three lights are connected in parallel across avolt 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.9
The following currents are measured in the same direction in a three-branch parallel circuit:mA,mA, andmA. The value of the current into the junction of these branches is
200 mA
540 mA
1.24 A
900 mA
Q.10
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.11
Total power in a parallel circuit is found by adding up the power of all the individual resistors.
True
False
Q.12
In a certain three-branch parallel circuit, R1 hasmA through it, R2 hasmA through it, and R3 hasmA through it. After measuring a total ofmA, you can say that
R3 is open
R1 is open
R2 is open
The circuit is operating properly
Q.13
An ammeter has an internal resistance ofΩ. The meter movement itself can handle up to 1 mA. IfmA is applied to the meter, the shunt resistor, RSHis approximately
55 Ω
5.5 Ω
50 Ω
9 Ω
Q.14
In a five-branch parallel circuit, there aremA 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.15
Four 8 Ω speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers isV, the amplifier must be able to deliver to the speakers
18 W
1.5 W
48 W
72 W
Q.16
AΩ resistor, aΩ resistor, and aΩ resistor are all in parallel. The total resistance is approximately
790 Ω
470 Ω
60 Ω
30 Ω
Q.17
The total resistance for two resistors in parallel is equal to the sum of the two resistors.
True
False
Q.18
When an open circuit occurs in a parallel branch, the total resistance decreases.
True
False
Q.19
Addition of resistors in parallel increases total resistance and decreases total current.
True
False
Q.20
The total current divides among parallel resistors in a manner directly proportional to the resistance values.
True
False
Q.21
There is a total ofmA of current into four parallel resistors. The currents through three of the resistors aremA,mA, andmA. The current through the fourth resistor is
490 mA
800 mA
310 mA
0 A
Q.22
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
12.5 Ω
200 Ω
20 kΩ
50 Ω
Q.23
A sudden increase in the total current into a parallel circuit may indicate
A drop in source voltage
An open resistor
An increase in source voltage
Either a drop in source voltage or an open resistor
Q.24
In a parallel circuit, the branch with the lowest resistance has the most current.
True
False
Q.25
When a 1.6 kΩ resistor and aΩ resistor are connected in parallel, the total resistance is
Greater than 1.6 kΩ
Greater than 120 Ω but less than 1.6 kΩ
Less than 120 Ω but greater than 100 Ω
Less than 100 Ω
Q.26
FiveΩ resistors are connected in parallel. If one resistor is removed, the total resistance is
25 Ω
500 Ω
100 Ω
20 Ω
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