( ( If ( ( ( a ( large number ) ) ( of charges ) ) ( ( carry ( little energy ) ) ( with them ) ) ) ) ( , ( ( their voltage ) ( ( is low ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (NP (DT a) (JJ large) (NN number)) (PP (IN of) (NP (NNS charges)))) (VP (VBP carry) (NP (JJ little) (NN energy)) (PP (IN with) (NP (PRP them)))))) (, ,) (NP (PRP$ their) (NN voltage)) (VP (VBZ is) (ADJP (JJ low))) (. .)))
If a large number of charges carry little energy with them, their voltage is low.
(ROOT (S (NP (NNP Voltage)) (VP (VP (VBZ is) (RB not) (NP (NP (DT the) (JJ same)) (PP (IN as) (NP (NN energy))))) (, ,) (CC but) (VP (VBZ means) (NP (NP (DT the) (NN energy)) (PP (IN per) (NP (NN unit) (NN charge)))))) (. .)))