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WorksheetsElectrical Circuits
Total questions: 63
Worksheet time: 2hrs 54mins
Name
Class
Date
1.
An electric circuit is a closed loop or pathway that allows electric charges to flow.
a)
True
b)
False
2.
A resistor is a device that converts chemical energy into electrical energy.
a)
True
b)
False
3.
A parallel connection is a type of electrical circuit in which there is a single current pathway.
a)
True
b)
False
4.
A series connection is a type of electric circuit in which there are multiple paths.
a)
True
b)
False
5.
A resistor is a device that controls current in electric circuits.
a)
True
b)
False
6.
An electric current is a flow of charged particles.
a)
True
b)
False
7.
In alternating current, the motion of the charges:
a)
continuously changes in the forward and reverse directions.
b)
is equal to the speed of light.
c)
is greater than the speed of light.
d)
is in the same direction of the electric field.
8.
If a 75 W light bulb operates at a voltage of 120 V, what is the current in the bulb?
a)
0.63 A
b)
1.6 A
c)
9.0 x 103 A
d)
1.1 x 10-4 A
9.
If a 325 W heater has a current of 6.0 A, what is the resistance of the heating element?
a)
88 Ω
b)
54 Ω
c)
9.0 Ω
d)
11 Ω
10.
Three resistors with values of 4.0 Ω, 6.0 Ω and 8.0 Ω respectively, are connected in series. What is their equivalent resistance?
a)
18
b)
8.0
c)
6.0
d)
1.8
11.
Three resistors connected in series carry currents labeled I1, I2 and I3 respectively.
Which of the following expresses the total current, It, in the system made up of the three resistors in series?
Which of the following expresses the total current, It, in the system made up of the three resistors in series?
a)
It =I 1 + I2 + I3
b)
It = (1I1 + 1/I2 + 1/I3
c)
It = I1 = I2 = I3
d)
It = (1I1 + 1/I2 + 1/I3)-1
12.
Three resistors with values of R1, R2 and R3 are connected in series.
Which of the following expresses the total resistance, R1, of the three resistors?
Which of the following expresses the total resistance, R1, of the three resistors?
a)
Rt = R1 + R2 + R3
b)
Rt = 1/R1 + 1/R2 + 1/R3
c)
Rt = R1 = R2 = R3
d)
Rt = (1/R1 + 1/R2 + 1/R3
13.
Three resistors with values of 4.0 Ω, 6.0 Ω and 10.0 Ω are connected in parallel. What is their equivalent resistance?
a)
20.0 Ω
b)
7.3 Ω
c)
6.0 Ω
d)
1.9 Ω
14.
The rate at which electric energy is transferred is:
a)
power
b)
voltage
c)
resistance
d)
current
15.
The current flowing in an electric circuit can be increased by:
a)
increasing voltage or decreasing resistance.
b)
decreasing voltage or increasing resistance.
c)
increasing voltage and increasing resistance.
d)
decreasing voltage and decreasing resistance.
16.
A relationship between current, voltage and resistance exists according to:
a)
Coulomb's Law
b)
Ohm's Law
c)
Newton's
d)
Kirchoff's Law
17.
An example of a wet cell battery is:
a)
the battery in your flashlight.
b)
the battery in your radio.
c)
the battery in your car.
d)
the battery in your CD player.
18.
In an electric circuit, charges:
a)
flow around in a closed loop.
b)
get energy from an external source.
c)
flow from higher potential to lower potential.
d)
do all of these answer choices.
19.
Compared to thin wires, electrical resistance in thick wires is:
a)
greater
b)
less
c)
the same
20.
When one bulb in a series circuit containing several light bulbs burn out:
a)
the other bulbs burn brighter.
b)
nothing changes in the rest of the circuit.
c)
none of the other bulbs will light up.
21.
When resistors are put in parallel with each other their overall resistance is:
a)
larger than that of any other resistor.
b)
the same as the resistance of one of the resistors.
c)
smaller than the resistance of any of the resistors.
22.
Current from a battery is:
a)
AC
b)
DC
23.
As the number of resistors in a parallel circuit is increased, what happens to the equivalent resistance of the circuit and total current in the circuit?
a)
Both equivalent resistance and total current decrease.
b)
Both equivalent resistance and total current decrease.
c)
Equivalent resistance and total current increases.
d)
Equivalent resistance increases and total current decreases.
24.
The electric potential difference across a conducting material is measured as:
a)
voltage
b)
resistance
c)
power
d)
current
25.
According to Ohm's Law, if the current is increased, what happens to the voltage across the resistor?
a)
It increases.
b)
It decreases.
c)
It remains the same.
26.
In a series circuit, three loads have a potential difference of 8.0 V, 12.0 V and 3.4 V respectively. The total current in the circuit is 3.00 amps. What is the amount of current through the second load?
a)
21.4 A
b)
3.0 A
c)
4.0 A
d)
7.6 A
27.
As loads are added in parallel to a circuit, what happens to the total current in the circuit?
a)
It increases.
b)
It remains the same.
c)
It decreases.
28.
What quantity is the same for each component of a circuit when they are wired in series with one another?
a)
voltage
b)
resistance
c)
current
d)
power
29.
A flashlight bulb is rated at 0.90 W. If the electric potential drop across the light bulb is 3.0 V, how much current goes through it?
a)
30 A
b)
3.3 A
c)
2.7 A
d)
0.3 A
30.
What is the effect on the current in a simple circuit when BOTH the voltage and the resistance are multiplied by two?
a)
1/2 I
b)
I
c)
2 I
d)
4 I
31.
A series circuit consists of a switch, a 6.0 V battery and some copper wire. Whenever the circuit is turned on, each of these elements have the same:
a)
current through it.
b)
resistance through it.
c)
potential difference across it.
d)
temperature.
32.
A car dashboard panel bulb has a resistance of 33 Ω when it is placed across a 12 V battery. What is the current through the circuit?
a)
0.36 A
b)
2.8 A
c)
3.96 A
d)
396 A
33.
A lamp uses 15 W of power when it is connected across 25 V. What is the current through the lamp?
a)
0/60 A
b)
1.67 A
c)
9390 A
d)
93800 A
34.
A light bulb uses 100W of power when connected across 120V. What is the current drawn by the light bulb?
a)
0.8 A
b)
1.0 A
c)
12.0 A
d)
2.0A
35.
A lamp draws a current of 0.50 A when it is connected to a 120 V source. What is the resistance of the lamp?
a)
4.17 x 10-2 Ω
b)
60 Ω
c)
2.4 x 102 Ω
d)
24 x 102 Ω
36.
In a simple circuit, a voltage of 5.0 V is applied across a resistance of 10.0 Ω. What is the power dissipated in the resistor?
a)
0.50 W
b)
5.0 W
c)
2.5 W
d)
50 W
37.
Three resistors of 10.0 Ω, 20.0 Ω and 25 Ω are connected in parallel across a 100 Ω battery. What is the equivalent resistance of the circuit and the current flowing through the 10 Ω resistor?
a)
0.19 Ω, 4 A
b)
6.67 Ω, 5 A
c)
5.26 Ω, 10 A
d)
55.0 Ω, 20 A
38.
A 20.0 Ω and a 40 Ω resistor are connected in series across a battery. If the current is 2.00 A, what is the voltage of the battery?
a)
30.0 V
b)
60.0 V
c)
80.0 V
d)
120 V
39.
A 2.00 Ω and 12.0 Ω resistor are connected in parallel across a 20.0 V battery. What is the current through the 2.0 Ω resistor?
a)
1.40 A
b)
1.67 A
c)
11.6 A
d)
10.0 A
40.
If a branch with a resistor is added to a parallel circuit, the equivalent resistance:
a)
increases.
b)
decreases.
c)
remains the same.
d)
becomes zero.
41.
A/An _________ is described as a type of circuit in which there is only a single current path.
a)
parallel circuit.
b)
series circuit.
c)
short circuit.
d)
voltage divider.
42.
Three resistors, 4.0 Ω, 8.0 Ω and 10.0 Ω respectively, are connected in series across an 11 V battery. The total potential difference across the 4.0 Ω and 8.0 Ω resistors is:
a)
2.0 V
b)
4.0 V
c)
6.0 V
d)
11 V
43.
A/An _________ is used to measure the potential difference across a portion of a circuit.
a)
ammeter
b)
battery
c)
resistor
d)
voltmeter
44.
If a resistor is added to a series circuit, the equivalent resistance:
a)
increases.
b)
decreases.
c)
remains the same.
d)
becomes zero.
45.
Which device measures the current in a circuit?
a)
ammeter
b)
amplifier
c)
voltmeter
d)
rheostat
46.
Potential difference is measured in:
a)
ohms
b)
ampere
c)
watts
d)
volts
47.
Resistance is measured in:
a)
joules
b)
ohms
c)
amperes
d)
watts
48.
Energy is measured in:
a)
joules
b)
ohms
c)
amperes
d)
watts
49.
Current is measured in:
a)
joules
b)
ohms
c)
amperes
d)
watts
50.
Power is measured in:
a)
joules
b)
ohms
c)
amperes
d)
watts
51.
Identify the following as characteristics of either a series circuit or a parallel circuit:
Consists of units wired in separate branches.
Consists of units wired in separate branches.
a)
Series circuit
b)
Parallel circuit
52.
Identify the following as characteristics of either a series circuit or a parallel circuit:
Type of circuit used to wire buildings.
Type of circuit used to wire buildings.
a)
Series circuit
b)
Parallel circuit
53.
Identify the following as characteristics of either a series circuit or a parallel circuit:
When one light bulb burns out, they all go out.
When one light bulb burns out, they all go out.
a)
Series circuit
b)
Parallel circuit
54.
Identify the following as characteristics of either a series circuit or a parallel circuit:
When one light bulb burns out, the rest stay lit.
When one light bulb burns out, the rest stay lit.
a)
Series circuit
b)
Parallel circuit
55.
Identify the following as characteristics of either a series circuit or a parallel circuit:
Current remains the same throughout the entire circuit.
Current remains the same throughout the entire circuit.
a)
Series circuit
b)
Parallel circuit
56.
Identify the following as characteristics of either a series circuit or a parallel circuit:
The total potential difference is the sum of all of the voltage drops.
The total potential difference is the sum of all of the voltage drops.
a)
Series circuit
b)
Parallel circuit
57.
Identify the following as characteristics of either a series circuit or a parallel circuit:
Voltage throughout the circuit remains the same.
Voltage throughout the circuit remains the same.
a)
Series circuit
b)
Parallel circuit
58.
Identify the following as characteristics of either a series circuit or a parallel circuit:
The circuit that has the lesser amount of total resistance.
The circuit that has the lesser amount of total resistance.
a)
Series circuit
b)
Parallel circuit
59.
What would happen to current if both voltage and resistance in a circuit were doubled?
a)
increase
b)
decrease
c)
remain the same
d)
become zero
60.
Two resistors of 5 Ω and 7 Ω are connected in series across a 24 V battery.
What is the equivalent resistance of the circuit?
What is the equivalent resistance of the circuit?
a)
2 Ω
b)
12 Ω
c)
17 Ω
d)
22 Ω
61.
Two resistors of 5 Ω and 7 Ω are connected in series across a 24 V battery.
What is the current in the circuit?
What is the current in the circuit?
a)
2 A, 2 A
b)
4 A, 4 A
c)
2 A, 4 A
d)
4 A, 2 A
62.
Two resistors of 5 Ω and 7 Ω are connected in series across a 24 V battery.
What is the current through each of the resistors?
What is the current through each of the resistors?
a)
10 V
b)
20 V
c)
30 V
d)
0 V
63.
Two resistors of 5 Ω and 7 Ω are connected in series across a 24 V battery.
What is the voltage drop across each of the resistors?
What is the voltage drop across each of the resistors?
a)
4 V
b)
14 V
c)
24 V
d)
44 V
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