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    deena2006's Avatar
    deena2006 Posts: 1, Reputation: 1
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    #1

    Jan 20, 2007, 03:39 AM
    Efficiency
    1. A 100w light bulb produces 8w of light
    What happens to the other 92w?
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #2

    Jan 20, 2007, 04:03 AM
    What other forms of energy do you know about? Which of these could be generated by the light bulb also?
    Evil dead's Avatar
    Evil dead Posts: 116, Reputation: -5
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    #3

    Jan 30, 2007, 11:12 AM
    Erm... radiation as heat?
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #4

    Jan 30, 2007, 11:15 AM
    Yes that's the main one. Pretty much all of it is heat.

    If you think about it, in order to emit mostly visible light, it has to be as hot as the sun. Which it isn't, and so it emits in the infra-red, which is heat.
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