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Burning fuel and a motor's efficiency

  1. Oct 13, 2014 #1
    1. The problem statement, all variables and given/known data
    A motor burns 20 liter per hour. the fuel's combustion heat is 6.6E6[cal/liter] (i don't know if it's kcal or cal, but i assume it's cal). the motor produces 40 [Hp], what's the efficiency.

    2. Relevant equations
    1[Hp]=746[W]. 1[W]=[Joule/sec]

    3. The attempt at a solution
    The fuel supplies less power the the motor's output. not true
  2. jcsd
  3. Oct 14, 2014 #2


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  4. Oct 14, 2014 #3
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