( ( ( ( ( In ( alternating ( current ( -LRB- ( q.v. -RRB- ) ) ) ) ) ( ( ( the motion ) ( of ( the ( electric charges ) ) ) ) ( ( is periodically ) reversed ) ) ) ; ) ( ( in ( direct ( current ( -LRB- ( q.v. -RRB- ) ) ) ) ) ( it ( is not ) ) ) ) . )
(ROOT (S (S (PP (IN In) (S (VP (VBG alternating) (NP (NP (JJ current)) (PRN (-LRB- -LRB-) (NP (NNP q.v.)) (-RRB- -RRB-)))))) (NP (NP (DT the) (NN motion)) (PP (IN of) (NP (DT the) (JJ electric) (NNS charges)))) (VP (VBZ is) (ADVP (RB periodically)) (ADJP (JJ reversed)))) (: ;) (S (PP (IN in) (NP (JJ direct) (JJ current) (-LRB- -LRB-) (NN q.v.) (-RRB- -RRB-))) (NP (PRP it)) (VP (VBZ is) (RB not))) (. .)))
In alternating current (q.v.) the motion of the electric charges is periodically reversed; in direct current (q.v.) it is not.
(ROOT (S (NP (VBG Alternating) (NN current)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (JJ electric) (NN current))) (SBAR (WHNP (WDT that)) (S (VP (VBZ keeps) (S (VP (VBG reversing) (NP (NN direction))))))))) (. .)))