Efficiency

The measure of usefulness of an operation, process or machine. Efficiency is calculated as the ratio of output to input (μ = Wo / Wi).

Calculator

Output (Wo) (W)

Input (Wi) (W)

Efficiency (decimal)--

Efficiency (percentage)-- %

Description	Output (Wo)	Input (Wi)	Efficiency (decimal)	Efficiency (%)
Electric Motor	1800	2000	0.9	90
Wind Mill	70	300	0.23	23