( ( Efficiency ( Output power ) ) ( ( divided ( by ( Input Power ) ) ) . ) )
(ROOT (S (NP (JJ Efficiency) (NN Output) (NN power)) (VP (VBN divided) (PP (IN by) (NP (NNP Input) (NNP Power)))) (. .)))
Efficiency Output power divided by Input Power.
(ROOT (S (NP (NNP Efficiency)) (VP (VBZ equals) (NP (NP (DT the) (NN output) (NN power)) (VP (VBN divided) (PP (IN by) (NP (DT the) (NN input) (NN power)))))) (. .)))