Electrical Potential, Current and Power
Date:
Name:
1.
2.
3.
4.
5.
Electrical power is measured in units called
A.
watts
B.
C.
volts
D. amperes
6.
joules
An electrical potential of one joule per coulomb is
equal to
A.
one coulomb
B.
C.
one ohm
D. one volt
7.
one ampere
ampere
B.
C.
watt
D. joule
B.
C.
36 joules
D. 4.0 joules
B.
6.0 sec
C.
35 sec
D. 150 sec
Shown are copper wires of identical cross-sectional
area. Which wire will have the least resistance?
C.
D.
The work required to move a charge of
3.0 coulombs through a potential di erence of
12 volts is
0.25 joule
5.0 sec
B.
volt
A.
A.
A.
A unit of electrical energy is the
A.
A circuit has a current of 5.0 amperes owing
through it. How long does it take for 30 coulombs
of charge to be transferred past a given point in
the circuit?
8.
9 joules
The diagram represents oppositely charged plates
in an evacuated glass tube. Which diagram below
represents the path of free electrons between the
charged plates?
9.
A.
10.
B.
C.
D.
page 1
An electric heater operates on 100 volts and a
current of 2.0 amperes. How much heat will it
produce in 5.0 seconds?
A.
24 cal
B.
240 cal
C.
2,400 cal
D. 24,000 cal
The circuit contains a power supply and two
resistors as shown. What is the voltage across
resistor R ?
A.
8.0 volts
B.
12 volts
C.
3.0 volts
D. 4.0 volts
Eight coulombs of electric charge ow through a
wire in two seconds. What is the current?
A.
10 amperes
B.
2 amperes
C.
8 amperes
D. 4 amperes
11.
12.
13.
14.
If the resistance of a circuit is doubled and the
voltage remains unchanged, the current owing in
the circuit will be
A.
one-half as much
B.
C.
one-fourth as much
D. four times as much
17.
twice as much
If the temperature of a current-carrying wire
increases, the resistance of the wire
A.
decreases
B.
C.
remains the same
18.
increases
A.
decrease
C.
remain the same
B.
5:00
102 W
B.
2:00
102 W
C.
1:80
105 W
D. 2:00
103 W
A student in the electricity lab plotted the graph
shown of current I established in a particular
circuit as a function of the voltage V applied to
the circuit. Which mathematical relationship most
probably exists between the current and voltage?
increase
Shown is a circuit diagram of a 120-volt power
source running a heater that draws 10.0 amperes
of current.
A.
0.083 watt
B.
C.
120 watts
D. 1,200 watts
19.
12 watts
If a wire of cross-sectional area equal to A has
a resistance of R, then another wire of the same
material with a cross-sectional area equal to 2A
will have a resistance of
A.
16.
A.
When the total resistance of a simple electrical
circuit is decreased while keeping the voltage
constant, the current in the electrical circuit will
How much power will be developed by the heater?
15.
An electrical heater raises the temperature
of a measured quantity of water. The water
absorbs 6,000 joules of energy from the heater
in 30.0 seconds. What is the minimum power
supplied to the heater?
R
B.
2R
C.
R
2
D.
20.
R
4
A.
direct linear
B.
direct square
C.
inverse
D. inverse square
As the resistance of a constant-voltage circuit is
increased, the power developed in the circuit
A.
decreases
B.
C.
remains the same
increases
What is the approximate amount of electrical
energy needed to operate a 1,600-watt toaster for
60 seconds?
A.
27 J
B.
1,500 J
C.
1,700 J
D. 96,000 J
Which device can be used to convert mechanical
energy into electrical energy?
A.
electric motor
B.
electric generator
C.
electroscope
D. electromagnet
page 2
Electrical Potential, Current and Power
21.
To increase the brightness of a desk lamp, a
student replaces a 60-watt light bulb with a
100-watt bulb. Compared to the 60-watt bulb, the
100-watt bulb has
A.
less resistance and draws more current
B.
less resistance and draws less current
C.
more resistance and draws more current
24.
In the circuits represented, the symbol for an
and the symbol for a voltmeter
ammeter is
is
. Which diagram represents the proper
connections for determining the resistance of a
circuit?
A.
D. more resistance and draws less current
22.
23.
B.
Each picture shows a light bulb connected to a
battery. Which bulb will light?
A.
B.
C.
D.
C.
D.
Look at the circuit in the picture below.
25.
A student uses a voltmeter to measure the potential
di erence across a circuit resistor. To obtain a
correct reading, the student must connect the
voltmeter
How would disconnecting a wire from Bulb C
a ect the circuit?
A.
in parallel with the circuit resistor
B.
in series with the circuit resistor
A.
Two of the bulbs would remain lit.
C.
before connecting the other circuit components
B.
Three of the bulbs would produce light.
D. after connecting the other circuit components
C.
The battery would lose energy to the bulbs.
D. The wires to the bulbs would turn red and
overheat.
page 3
Electrical Potential, Current and Power
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Electrical Potential, Current and Power
01/31/2014
1.
Answer:
A
21.
Answer:
A
2.
Answer:
D
22.
Answer:
D
3.
Answer:
D
23.
Answer:
4.
Answer:
C
24.
Answer:
A
5.
Answer:
A
25.
Answer:
A
6.
Answer:
B
7.
Answer:
B
8.
Answer:
B
9.
Answer:
A
10.
Answer:
D
11.
Answer:
A
12.
Answer:
B
13.
Answer:
B
14.
Answer:
D
15.
Answer:
C
16.
Answer:
B
17.
Answer:
B
18.
Answer:
A
19.
Answer:
A
20.
Answer:
D