Question

A machine is supplied Energy at a rate of 4000 W and does useful work at a rate of 3760 W. What is the efficiency of the machine?

Answer 1

94%

Step-by-step explanation:

Answer 2

The efficiency of a machine is the ratio between the output power and the power in input:

`\epsilon = (P_(out))/(P_(in))`
in our problem, the output power is 3760 W while the input power is 4000 W, so the efficiency is

`\epsilon = (3760 W)/(4000 W) =0.94`
So the efficiency of the machine is 94%.