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 is the efficiency of the machine?

Answer 1

your answer is 94 percent

i just took the test

Answer 2

Efficiency = (output power) / (input power)

= (3,760 joule/sec) / (4,000 joule/sec)

= 3,760 / 4,000 = 0.94 = 94%