Question

A machine has an efficiency of $25$. If energy is fed into the machine at the rate of $1kW$, then the output of the machine is:

• A. $1250watt$
• B. $750watt$
• C. $250watt$
• D. $50watt$

Answer 1

The correct option is C $250watt$

Given

Efficiency, $\eta =25$

$output=\eta \times input=0.25\times 1000=250W$