Efficiency

Written by Jerry Ratzlaff on . Posted in Classical Mechanics

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

 

Efficiency formulas

\(\large{ \eta =  \frac {E_o} {E_i} 100 \% }\)   
\(\large{ \eta =  \frac {W_o} {W_i} 100 \% }\)   

Where:

 Units 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 \(\large{ft-lbf}\) \(\large{J}\)
\(\large{ W_i }\) = input work \(\large{ft-lbf}\) \(\large{J}\)
\(\large{ W_o }\) = output work \(\large{ft-lbf}\) \(\large{J}\)

 

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Tags: Energy Equations Efficiency Equations