Home/Basic Physics/Work, energy and power/Efficiency6. Work, energy and powerEfficiencyIn 6. Work, energy and powerFormulaCopy LaTeXη=EuˊtilEentrada\eta=\frac{E_{\text{útil}}}{E_{\text{entrada}}}η=EentradaEuˊtilorCopy LaTeXη=PuˊtilPentrada\eta=\frac{P_{\text{útil}}}{P_{\text{entrada}}}η=PentradaPuˊtilTagsenergyphysicsphysics formulaworkwork energy powerDetailRatio of useful energy or power to input energy or power.Found an error? Contact us.Related formulasRelatedEfficiency of a heat engineη=WQH=1−QCQH\eta=\frac{W}{Q_H} = 1-\frac{Q_C}{Q_H}η=QHW=1−QHQCOpen formulaOpen in section