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1 December, 14:20

A certain 100W light bulb has an efficiency of 95%. How much thermal energy will this light bulb add to the inside of a room in 2.5h if the bulb is on for the whole time?

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  1. 1 December, 18:05
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    Since the bulb consumes 100 watts of power and its efficiency is 95%,

    it generates 95 watts of light energy and 5 watts of heat energy whenever

    it's turned on.

    5 watts means 5 joules of energy per second.

    (2.5 hours) x (3,600 seconds/hour) = 9,000 seconds

    (9,000 seconds) x (5 joules/second) = 45,000 joules of heat in 2.5 hours
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