| work, power probelm?

work, power probelm?

Katie E asked:


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?

1hp = 750 watts
power=work/time
work=force*distance

1.1hp= 825 watts
5.6 h=20160s
power*time=work
(825w)(20160s)=16632000J I’m confused on what the question is asking for, is it asking for work?

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Comments

One Response to “work, power probelm?”

  1. Rackbrane on March 26th, 2009 12:56 am

    Yes, that’s right. Energy is the same as work.

    In reality, though, no machine is 100% efficient, and therefore the useful work out is less than the energy consumption.