20 of useful work is performed by a machine when 80 of energy is applied calculate the efficiency of the machine

Answer 1

To calculate the efficiency of the machine, we can use the formula:

Efficiency = (Useful work output / Energy input) x 100

Given that 20 units of work is performed by the machine when 80 units of energy is applied, we have:

Useful work output = 20 units
Energy input = 80 units

So, plugging these values into the formula, we get:

Efficiency = (20 / 80) x 100
Efficiency = (1/4) x 100
Efficiency = 25%

Therefore, the efficiency of the machine is 25%.