( ( ( ( Voltage ( is ( ( the amount ) ( of ( ( ( stored ( electrical energy ) ) ( -LRB- ( potential -RRB- ) ) ) ( provided ( by ( an ( energy source ) ) ) ) ) ) ) ) ) and ) ( ( its units ) ( are ( given ( in Volts ) ) ) ) ) . )
(ROOT (S (S (NP (NNP Voltage)) (VP (VBZ is) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NP (JJ stored) (JJ electrical) (NN energy)) (PRN (-LRB- -LRB-) (NP (NN potential)) (-RRB- -RRB-)) (VP (VBN provided) (PP (IN by) (NP (DT an) (NN energy) (NN source))))))))) (CC and) (S (NP (PRP$ its) (NNS units)) (VP (VBP are) (VP (VBN given) (PP (IN in) (NP (NNP Volts)))))) (. .)))
Voltage is the amount of stored electrical energy (potential) provided by an energy source and its units are given in Volts.
(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.