A 100-W light bulb is left on for 8.0 hours.Over this period of time,how much energy was used by the bulb?
A)8.0E+2 J
B)2.9E+5 J
C)2.9E+6 J
D)1.34 hp
E)2.9E+4 J

Name: A 100-W light bulb is left on for 8.0 hours.Over this period of time,how much energy was used by the bulb? A)8.0E+2 J B)2.9E+5 J C)2.9E+6 J D)1.34 hp E)2.9E+4 J
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Question

Quizplus · Accepted Answer

Energy = Power x Time
Energy = 100 W x 8.0 hours = 800 Wh
Since 1 Wh = 3.6E+3 J, then 800 Wh = 2.9E+6 J
Therefore, the answer is C.

A 100-W Light Bulb Is Left on for 8