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

The input power is 200 W

Explanation:

Motor Efficiency

The efficiency of a motor can be calculated as follows:

Where:

β   = efficiency

Po = Output power

Pi  = Input power

Solving for Pi:

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

The input power is 200 W

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