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Section 12.2
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1
Which of the following appliances has the highest typical power rating?
A)a computer with monitor and printer
B)a washing machine
C)a dishwasher
D)a microwave
2
When referring to the electrical energy usage of appliances, the most practical units are…
A)kilowatt-hours.
B)kilowatts
C)watts per second.
D)joules.
3
A hair dryer is rated at 1200 W. On average, it is used five minutes per day, when the cost of energy is 8.8 cents/kWh. What does it cost to operate the hair dryer for one year?
A)$3.21
B)$30.42
C)$36.50
D)$321.20
4
The phantom load of an average home is…
A)25 kJ.
B)50 W.
C)75 kW.
D)2000 MW.
5
Which type of light source is the most efficient?
A)a fluorescent bulb
B)an LED (light-emitting diode)
C)an incandescent bulb
D)a halogen bulb





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