Additional Practice ProblemsElectricity  
  • 1.A lightbulb is plugged into a 120-V wall outlet. How much electric power does the lightbulb use if the current in the bulb is 0.5 A?

    1. 55 W

    2. 60 W

    3. 62 W

    4. 65 W

  • 2.A lightbulb is plugged into a 120-V wall outlet. How much electric power does the lightbulb use if the current in the bulb is 0.6 A?

    1. 55 W

    2. 62 W

    3. 66 W

    4. 72 W

  • 3.A lightbulb is plugged into a 120-V wall outlet. How much electric power does the lightbulb use if the current in the bulb is 0.64 A?

    1. 55.5 W

    2. 62.3 W

    3. 74.3 W

    4. 76.8 W

  • 4.A toaster is plugged into a 120-V wall outlet. How much electric power does the toaster use if the current in the toaster is 10 A?

    1. 1000 W

    2. 1200 W

    3. 1300 W

    4. 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?

    1. 15 W

    2. 12.0 A

    3. 13.6 A

    4. 14.2 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?

    1. 17.0 W

    2. 16.5 A

    3. 18.2 A

    4. 19.2 A

  • 7.What is the voltage supplied to a dryer if the dryer uses 5000 W of power and has a 20.0-A current through to it.

    1. 200 V

    2. 220 V

    3. 250 V

    4. 180 V

  • 8.What is the voltage supplied to a dryer if the dryer uses 4200 W of power and has a 22.0-A current through to it.

    1. 180 V

    2. 186 V

    3. 191 V

    4. 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?

    1. 22 A

    2. 25 A

    3. 27 A

    4. 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?

    1. 22 A

    2. 27 A

    3. 29 A

    4. 32 A

  • 11.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?

    1. 0.3 kWh

    2. 0.5 kWh

    3. 0.7 kWh

    4. 0.9 kWh

  • 12.A microwave oven with a power rating of 2000 W is used for 0.3 h. How much electrical energy is used by the microwave?

    1. 0.2 kWh

    2. 0.5 kWh

    3. 0.6 kWh

    4. 0.8 kWh

  • 13.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?

    1. 0.2 kWh

    2. 0.4 kWh

    3. 0.6 kWh

    4. 0.8 kWh

  • 14.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?

    1. 0.66 kWh

    2. 0.82 kWh

    3. 0.88 kWh

    4. 0.96 kWh

  • 15.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 refrigerator use in one day?

    1. 5 kWh

    2. 6 kWh

    3. 7 kWh

    4. 8 kWh

  • 16.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 refrigerator use in one day?

    1. 2.8 kWh

    2. 4.5 kWh

    3. 5 kWh

    4. 5.25 kWh

  • 17.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?

    1. 1.2 h

    2. 1.5 h

    3. 3 h

    4. 5 kWh

  • 18.A TV with a power rating of 400 W uses 0.8 kWh in one day. For how many hours was the TV on during this day?

    1. 2 h

    2. 3 h

    3. 4 h

    4. 6 h

  • 19.A TV with a power rating of 400 W uses 0.7 kWh in one day. For how many hours was the TV on during this day?

    1. 1.8 h

    2. 3 h

    3. 5 h

    4. 7 h

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