Physical Science

Chapter 7: Electricity

Solve a Simple Equation

1.
A lightbulb is plugged in a 110-V wall outlet. How much electric power does the lightbulb use if the current in the bulb is 0.5 A?
A)50 W
B)55 W
C)62 W
D)65 W
2.
A lightbulb is plugged in a 110-V wall outlet. How much electric power does the lightbulb use if the current in the bulb is 0.6 A?
A)55 W
B)62 W
C)66 W
D)72 W
3.
A lightbulb is plugged in a 110-V wall outlet. How much electric power does the lightbulb use if the current in the bulb is 0.65 A?
A)55.5 W
B)62.3 W
C)71.5 W
D)74.3 W
4.
A toaster is plugged in a 110-V wall outlet. How much electric power does the lightbulb use if the current in the bulb is 10.9 A?
A)1200 W
B)1000 W
C)1300 W
D)1500 W
5.
What is the current in a toaster if the toaster uses 1500 W of power when plugged into a 110-V wall outlet?
A)15 W
B)12.0 A
C)14.2 A
D)13.6 A
6.
What is the current in a toaster if the toaster uses 2000 W of power when plugged into a 110-V wall outlet?
A)17.0 W
B)18.2 A
C)16.5 A
D)19.2 A
7.
What is the voltage in a dryer if the dryer uses 5000 W of power when plugged into a 20.0-A wall outlet?
A)200 V
B)220 V
C)250 V
D)180 V
8.
What is the voltage in a dryer if the dryer uses 4200 W of power when plugged into a 22.0-A wall outlet?
A)191 V
B)186 V
C)180 V
D)200 V
9.
What is the current in a dryer if the dryer uses 5600 W of power when plugged into a 220-V wall outlet?
A)22 A
B)25 A
C)27 A
D)29 A
10.
What is the current in a dryer if the dryer uses 6000 W of power when plugged into a 220-V wall outlet?
A)32 A
B)22 A
C)29 A
D)27 A
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