How do you calculate the efficiency of a simple machine?

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How do you calculate the efficiency of a simple machine?

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Answer 1 · 2015-11-10T22:50:26

Efficiency is defined as the ratio of the power output to the power input.
$η = \frac{P_{o u t}}{P_{i n}}$ $eta = (P_(out))/(P_( i n ))$ .

Since power is the rate of doing work and the 2 powers occur for the same time while the machine operates, we may also then write efficiency as the ratio of the energy output to the energy input.
$η = \frac{W_{o u t}}{W_{i n}}$ $eta = (W_(out))/(W_(i n))$

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How do you calculate the efficiency of a simple machine?

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