Question

How is the efficiency of a machine calculated?
Efficiency = Output work - Input work
Efficiency = Output work / Input work X 100
Efficiency = Output work + Input work
Efficiency = Input work / Output work X 100

Answer 1

The correct formula to calculate the efficiency of a machine is:

Efficiency = Output work / Input work X 100

This formula calculates the percentage of input work that is converted into useful output work by a machine.