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24 March, 21:28

A lightbulb has a power of 100 W. and is used for 4 hours. A microwave has a power of 1200 W and is used for 5 minutes.

a. How much energy is used by the lightbulb?

b. How much energy is used by the microwave?

c. The lightbulb has an efficiency of 1.8%. How much heat energy does the lightbulb produce in 4 hours?

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  1. 25 March, 00:35
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    a) E=Nt=100 * (4*3600) = 1440000 J

    b) E=1200 * (5*60) = 360000 J

    c) Q=E * (100-1.8) / 100=1414080 J
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Home » Physics » A lightbulb has a power of 100 W. and is used for 4 hours. A microwave has a power of 1200 W and is used for 5 minutes. a. How much energy is used by the lightbulb? b. How much energy is used by the microwave? c. The lightbulb has an efficiency of 1.
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