In a motor, the of output work to input work, expressed as a percentage, is the efficiency of the motor.

The correct answer of this question is : Ratio

EXPLANATION:

The efficiency of a motor is defined as the ratio of output work to the input work, expressed as a percentage.

Let us consider a machine on which W amount of work is done.

Let W' is the amount of work delivered by the machine.

Hence, input work = W

          Output work = W'

Hence, the efficiency of the machine is written as-

                     Efficiency

Hence, the correct answer to the question is ratio.

f=ma newton's second law 7x8=56n

answerscientific theory;