Mechanical Efficiency

Mechanical efficiency, abbreviated as \( \eta_m \) (Greek symbol eta), a dimensionless number, is the ratio of work output to work input.

 

Mechanical Efficiency formula
\(\large{ \eta =  \frac{W_o}{W_i}\; 100 }\)
Symbol	English	Metric
\(\large{ \eta }\)  (Greek symbol eta) = efficiency	\(\large{dimensionless}\)
\(\large{ W_i }\) = input work	\(\large{ft-lbf}\)	\(\large{J}\)
\(\large{ W_o }\) = output work	\(\large{ft-lbf}\)	\(\large{J}\)