Calculate the efficiency for each machine, then answer the question. machine a has an input work of 1,000 j and an output work of 250 j. machine b has an input work of 500 j and an output work of 350 j. machine c has an input work of 200 j and an output work of 150 j. which machine is the most efficient?

Explanation:

Efficiency is defined as the measure of amount of work done by a system.

Mathematically,        

         Efficiency =

                          =

                          = 25%

  Efficiency =

                          =

                          = 70%

  Efficiency =

                          =

                          = 75%

Thus, we can see that efficiency is maximum in machine C, therefore, machine C is the most efficient.

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