Section 22.2
Using Electric Energy
Practice Test
1.
A 12.0 V battery delivers a 1.20 A current to an electric motor that is connected across terminals. What power is consumed by the motor?
a.
10.0 W
b.
10.0 J
c.
14.4 W
d.
14.4 J
Hint
2.
A kilowatt-hour is equivalent to:
a.
3.6×10
6
J/s
b.
3.6×10
6
J
c.
1.0×10
3
J/s
d.
1.0×10
3
J
Hint
3.
A 75.0 W lightbulb is 25.0% efficient. How many joules of thermal energy does the lightbulb produce each minute?
a.
3380 J
b.
4500 J
c.
1130 J
d.
563 J
Hint
4.
What is a superconductor?
a.
a magnet
b.
a material with zero resistance
c.
a meterial with a very high resistance
d.
a powerful battery
Hint
5.
Electric power is given by:
a.
P
=
I
2
R
b.
P
=
V
2
R
c.
P
=
IR
d.
P
=
VR
Hint
6.
Thermal energy is given by:
a.
E
=
P
2
t
b.
E
=
Pt
c.
E
=
IR
d.
E
=
I
2
R
Hint
