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How much energy does a 100-W electric bulb consume in two hours?
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Solution:

w = pt = 100 (W) × 2 (h) × 60 (min/h) × 60 (s/min)

= 720,000 J = 720 kJ

This is the same as

w = pt = 100 W × 2 h = 200 Wh
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