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Power of an engine

  1. Sep 11, 2014 #1
    1. The problem statement, all variables and given/known data
    An engine goes through a "square" circuit process (is btw "circuit process" this the correct term in English?) according to the diagram below:
    attachment.php?attachmentid=73010&stc=1&d=1410425307.png

    a) How much work is performed by the engine during one revolution in the circuit process?
    b) What effect does the engine deliver if it takes 0.2 s for the circuit process to go through one revolution?

    2. Relevant equations
    W = p*V
    P = W*t

    3. The attempt at a solution
    For a) we have simply the area within the square, which is 1.6 kJ.

    For b) if we have W = 1.6 kJ and t = 0.2 s, then we should get P = 1.600 J * 0.2 s = 320 W. Why is this not correct?
     

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  3. Sep 11, 2014 #2

    andrevdh

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    Homework Helper

    You should divide, not multiply - power is the rate at which work is done by the engine.
     
  4. Sep 11, 2014 #3
    Ah yes, of course. :redface: Thanks.
     
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