Watt do you Know? Take our Energy Quiz!
(Page 5 of 8)
June 9, 2008
By Megan Phelps
7. Say you have a 100-watt incandescent light bulb in your living room. How much energy would that light bulb consume if you left it on for 10 hours?
A. 100 watts
B. 10 kilowatts
C. 1,000 watt hours
D. 1,000 kilowatt hours
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Answer: C. 1,000 watt hours.
That’s equal to 1 kilowatt. (And if you're keeping track, that's also 1.3 pounds of carbon dioxide emissions, and 10 cents on your utility bill, at least according to the U.S. average.)
8. If you replaced that 100 watt incandescent bulb with an equally bright compact-fluorescent, you would probably use a 23-watt CFL. How much energy would the CFL use if you left it on 10 hours?
A. 230 watts
B. 2,300 kilowatts
C. 230 watt hours
D. 230,000 watt hours
Answer: C. It would use 230 watt hours.
That’s 770 watt hours less than the incandescent would have used. Those numbers really add up over time. (And award yourself one bonus point if you wondered if there was actually a good reason for that light bulb to be on for 10 hours.)
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