( Voltage ( ( is ( ( ( a measure ) ( of ( electric ( potential energy ) ) ) ) ( that ( ( makes ( electric ( charges flow ) ) ) ( through ( a circuit ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Voltage)) (VP (VBZ is) (NP (NP (DT a) (NN measure)) (PP (IN of) (NP (JJ electric) (JJ potential) (NN energy))) (SBAR (WHNP (WDT that)) (S (VP (VBZ makes) (NP (JJ electric) (NNS charges) (NN flow)) (PP (IN through) (NP (DT a) (NN circuit)))))))) (. .)))
Voltage is a measure of electric potential energy that makes electric charges flow through a circuit.
(ROOT (S (NP (PRP We)) (VP (VBP use) (ADJP (JJ voltage) (S (VP (TO to) (VP (VB keep) (NP (NP (NN track)) (PP (IN of) (NP (JJ electric) (JJ potential) (NN energy))))))))) (. .)))
We use voltage to keep track of electric potential energy.