Efficiency

Efficiency, abbreviated as \(\eta\) (Greek symbol eta), a dimensionless number, is expressed in percentage and always less than 100%.

 

Efficiency with Energy formula
\(\large{ \eta =  \frac{E_o}{E_i} \;100 }\)
Symbol	English	Metric
\(\large{ \eta }\)  (Greek symbol eta) = efficiency	\(\large{dimensionless}\)
\(\large{ E_i }\) = input energy	\(\large{ft-lbf}\)	\(\large{J}\)
\(\large{ E_o }\) = output energy	\(\large{ft-lbf}\)	\(\large{J}\)

 

Efficiency with work 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	\(\large{ft-lbf}\)	\(\large{J}\)