Physical Science

Chapter 7: Electricity

Solve a Simple Equation

1.
A microwave oven with a power rating of 1000 W is used for 0.3 h. How much electrical energy is used by the microwave?
A)0.3 kWh
B)0.5 kWh
C)0.7 kWh
D)0.9 kWh
2.
A microwave oven with a power rating of 1200 W is used for 0.5 h. How much electrical energy is used by the microwave?
A)0.5 kWh
B)0.6 kWh
C)0.8 kWh
D)0.2 kWh
3.
A microwave oven with a power rating of 1000 W is used for 0.4 h. How much electrical energy is used by the microwave?
A)0.2 kWh
B)0.6 kWh
C)0.8 kWh
D)0.4 kWh
4.
A microwave oven with a power rating of 1200 W is used for 0.8 h. How much electrical energy is used by the microwave?
A)0.96 kWh
B)0.88 kWh
C)0.82 kWh
D)0.66 kWh
5.
A refrigerator operates on average for 8.0 h a day. If the power rating of the refrigerator is 800 W, how much electrical energy does the refrigeraor use in one day?
A)8 kWh
B)6.6 kWh
C)6.4 kWh
D)9 kWh
6.
A refrigerator operates on average for 6.0 h a day. If the power rating of the refrigerator is 1000 W, how much electrical energy does the refrigeraor use in one day?
A)5 kWh
B)7 kWh
C)8 kWh
D)6 kWh
7.
A refrigerator operates on average for 7.0 h a day. If the power rating of the refrigerator is 750 W, how much electrical energy does the refrigeraor use in one day?
A)5.25 kWh
B)5 kWh
C)4.5 kWh
D)2.8 kWh
8.
A TV with a power rating of 400 W uses 0.6 kWh in one day. For how many hours was the TV on during this day?
A)1.2 h
B)1.5 h
C)3 h
D)5 kWh
9.
A TV with a power rating of 300 W uses 0.8 kWh in one day. For how many hours was the TV on during this day?
A)4 h
B)3 h
C)2.7 h
D)6 kWh
10.
A TV with a power rating of 250 W uses 0.7 kWh in one day. For how many hours was the TV on during this day?
A)2.8 h
B)3 h
C)5 h
D)7 kWh
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