( ( The efficiency ) ( ( ( ( ( is ( pretty easy ) ) ( to calculate ) ) , ) ( as ( ( ( ( ( the ( input power ) ) ( minus ( ( the sum ) ( of ( the ( motor losses ) ) ) ) ) ) , ) ( -LRB- ( ( output power ) -RRB- ) ) ) ( divided ( by ( the ( input power ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN efficiency)) (VP (VBZ is) (ADJP (RB pretty) (JJ easy)) (S (VP (TO to) (VP (VB calculate)))) (, ,) (PP (IN as) (NP (NP (NP (DT the) (NN input) (NN power)) (PP (CC minus) (NP (NP (DT the) (NN sum)) (PP (IN of) (NP (DT the) (NN motor) (NNS losses))))) (, ,) (PRN (-LRB- -LRB-) (NP (NN output) (NN power)) (-RRB- -RRB-))) (VP (VBN divided) (PP (IN by) (NP (DT the) (NN input) (NN power))))))) (. .)))
The efficiency is pretty easy to calculate, as the input power minus the sum of the motor losses, (output power) divided by the 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)))))) (. .)))