Question

If a 0.75 efficient motor produces 150 W of useful power, what was the input power? *

Answer 1

The input power is 200 W

Step-by-step explanation:

Motor Efficiency

The efficiency of a motor can be calculated as follows:

`\displaystyle \beta=(P_o)/(P_i)`

Where:

β = efficiency

Po = Output power

Pi = Input power

Solving for Pi:

`\displaystyle P_i=(P_o)/(\beta)`

The efficiency is β=0.75 and the output power is Po=150 W, thus the input power is:

`\displaystyle P_i=(150)/(0.75)`

`P_i=200 \ W`

The input power is 200 W