Question

A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What's the efficiency of the machine? A. 92 percent B. 97 percent C. 96 percent D. 94 percent

Answer 1

Answer:The efficiency is (d).94%

Explanation:

The efficiency:

E=100× (output/input)

So the input is 4000W and the out put is 3760W

From the above formula

E=100×(3760/4000)

E=376000/4000

E=94%