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Homework Help: Energy consumed by a motor

  1. Nov 26, 2007 #1
    1. The problem statement, all variables and given/known data
    A small air compressor operates at 1.1 hp electric motor for 5.6 hours a day. How much energy is consumed by the motor daily?

    2. Relevant equations

    1hp = 750 watts

    3. The attempt at a solution
    1.1hp= 825 watts
    5.6 h=20160s
    (825w)(20160s)=16632000J I'm confused on what the question is asking for, is it asking for work?
  2. jcsd
  3. Nov 26, 2007 #2


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    Staff Emeritus
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    Gold Member

    What you've done is correct. A Watt is one joule per second, thus your answer is in joules and is therefore a value for energy. Work is just the change in energy of an object.
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