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27 May, 15:04

A 4-watt night light is left on for 8 hours each night. How much work dies it do per night

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  1. 27 May, 16:00
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    The light bulb doesn't do any "work" ... it doesn't exert force,

    or maintain a force through a distance. It does, however,

    dissipate energy, in the form of heat and light.

    The quantity of energy that it dissipates is ...

    (4 watts) x (8 hours) x (3600 sec/hour) x (1 joule/watt-sec)

    = (4 x 8 x 3600) joules = 115,200 joules.
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