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Thread: Useful energy / wasted energy HELP

  1. #1 Useful energy / wasted energy HELP 
    New Member
    Join Date
    May 2009
    Posts
    1
    please tell me about Useful energy / wasted energy of...
    1. electric kettle
    2. headphones


    PLEASE HELP ~~


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  3. #2  
    Time Lord
    Join Date
    Mar 2007
    Posts
    8,035
    Is this homework?

    1) - An electric kettle wastes energy by way of sending some of the heat into the surrounding environment (instead of all of it reaching your food)

    2) - Headphones .... don't waste a lot of energy, but I guess some of the sound doesn't always reach your ears.

    If you're looking for losses because of transducing one energy type to another, the conversion of electricity to sonic/kinetic energy in your headphones is probably not perfectly efficient. The conversion of electricity to heat is usually pretty efficient, however, because the conversion of anything into heat is an efficient conversion. (Most losses in any conversion are in the form of some of your energy becoming heat)


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