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WorksheetsCircuits
Total questions: 25
Worksheet time: 13mins
Name
Class
Date
1.
Two resistors are connected to a source of voltage as shown in the diagram below. At which position should an ammeter be placed to measure the current passing only through resistor R1?
a)
1
b)
2
c)
3
d)
4
2.
What must be inserted between points A and B to establish a steady electric current in the incomplete circuit represented in the diagram below?
a)
magnetic field source
b)
switch
c)
source of potential difference
d)
voltmeter
3.
A 2.0-ohm resistor and a 4.0-ohm resistor are connected in series with a 12-volt battery. If the current through the 2.0-ohm resistor is 2.0 amperes, the current through the 4.0-ohm resistor is
a)
1.0 A
b)
2.0 A
c)
3.0 A
d)
4.0 A
4.
Where should an ammeter be located to correctly measure the total current and where should a voltmeter be located to correctly measure the total voltage?
a)
ammeter at 3 and voltmeter at 4
b)
ammeter at 1 and voltmeter at 4
c)
ammeter at 2 and voltmeter at 3
d)
ammeter at 1 and voltmeter at 2
5.
Resistors R1 and R2, connected in parallel, have an equivalent resistance of 6 ohms when connected in the circuit shown below. The resistance of R1 could be
a)
1 ohm
b)
4 ohms
c)
5 ohms
d)
8 ohms
6.
A 30.-ohm resistor and a 60.-ohm resistor are connected in an electric circuit as shown below. Compared to the electric current through the 30.-ohm resistor, the electric current through the 60.- ohm resistor is
a)
smaller
b)
larger
c)
cannot be determined
d)
the same
7.
An electric circuit contains an operating heating element and a lit lamp. Which statement best explains why the lamp remains lit when the heating element is removed from the circuit?
a)
The lamp has less resistance than the heating element.
b)
The lamp has more resistance than the heating element
c)
The lamp and heating element were connected in parallel.
d)
The lamp and heating element were connected in series.
8.
A circuit consists of a resistor and a battery. Increasing the voltage of the battery while keeping the temperature of the circuit constant would result in an increase in
a)
current only
b)
resistance only
c)
both current and resistance
d)
neither resistance nor current
9.
The current through a 10.-ohm resistor is 1.2 amperes. What is the potential difference across the resistor?
a)
14V
b)
12V
c)
120V
d)
8.3V
10.
A 9.0-volt battery is connected to a 4.0-ohm resistor and a 5.0-ohm resistor as shown in the diagram below. What is the total resistance
a)
4 ohms
b)
5 ohms
c)
1 ohms
d)
9 ohms
11.
A 9.0-volt battery is connected to a 4.0-ohm resistor and a 5.0-ohm resistor as shown in the diagram below. What is the current?
a)
1.0 Amps
b)
1.3 Amps
c)
1.8 Amps
d)
9 Amps
12.
A potential drop of 50. volts is measured across a 250-ohm resistor. What is the power developed in the resistor?
a)
50 watts
b)
10 watts
c)
5 watts
d)
.20 watts
13.
How much time is required for an operating 60-watt light bulb to use 120 joules of electrical energy?
a)
2 sec
b)
.2 sec
c)
.5 sec
d)
5 sec
14.
A complete circuit is left on for several minutes, causing the connecting copper wire to become hot. As the temperature of the wire increases, the electrical resistance of the wire
a)
increases
b)
decreases
c)
remains the same
15.
If the diameter of a wire were decreased, its electrical resistance would
a)
increases
b)
decreases
c)
remains the same
16.
Which of the following changes to the wires of a circuit would result in the greatest decrease in resistance?
a)
making them longer and thinner
b)
making them shorter and thinner
c)
making them longer and wider
d)
making them shorter and wider
17.
At 20deg C, four conducting wires made of different materials have the same length and the same diameter. Which wire has the least resistance?
a)
nichrome
b)
gold
c)
aluminum
d)
tungsten
18.
What is the current measured by ammeter A?
a)
0.5 Amps
b)
2 Amps
c)
72 Amps
d)
6 Amps
19.
What is the voltage drop across the 36 ohm resistor?
a)
12V
b)
3V
c)
0.33V
d)
24V
20.
Which of the following is true of the circuit when switch S is open
a)
the circuit doesn't work
b)
both R1 and R2 work
c)
only R1 works
d)
only R2 works
21.
A charge of 5.0 coulombs moves through a circuit in 0.50 second. The current in the circuit is
a)
10A
b)
5.0A
c)
2.5A
d)
7.0A
22.
Which physical quantity is correctly paired with its unit?
a)
current and amperes/sec
b)
current and coulombs/sec
c)
power and joules
d)
power and watts/sec
23.
A circuit is shown below. Which of the following is true of this circuit?
a)
It is series and therefore both resistors have the same voltage
b)
It is series and therefore both resistors have the same current
c)
It is parallel and therefore both resistors have the same voltage
d)
It is parallel and therefore both resistors have the same current
24.
A 150-watt light bulb is brighter than a 60.-watt light bulb when both are operating at a potential difference of 110 volts. The 150-watt bulb is brighter because
a)
The 150watt bulb has a greater resistance
b)
The 60watt bulb has a greater resistance
c)
both have the same resistance
25.
Two identical lamps, L1 & L2, are connected to a constant voltage power supply. The voltage drop across L1 is 36V. What is the voltage of the power supply?
a)
18V
b)
36V
c)
6V
d)
72V
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