The total energy input ${E_{in}}$ in a process is partly transferred to useful energy output U and partly transferred to energy that is wasted W.
What is the efficiency of the process?
$\frac{U}{{{E_{in}}}} \times 100\% $
2 )
$\frac{W}{{{E_{in}}}} \times 100\% $
3 )
$\frac{U}{W} \times 100\% $
4 )
$\frac{{U + W}}{{{E_{in}}}} \times 100\% $
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