( ( The ( moving water ) ) ( ( represents ( ( the ( current flowing ) ) ( around ( the circuit ) ) ) ) . ) )
(ROOT (S (NP (DT The) (VBG moving) (NN water)) (VP (VBZ represents) (NP (NP (DT the) (JJ current) (VBG flowing)) (PP (IN around) (NP (DT the) (NN circuit))))) (. .)))
The moving water represents the current flowing around the circuit.
(ROOT (S (NP (DT A) (NN current)) (VP (VBZ is) (NP (NP (DT a) (NN stream)) (PP (IN of) (S (VP (VBG moving) (NP (NP (NN water)) (SBAR (WHNP (WDT that)) (S (VP (VBZ flows) (PP (IN through) (NP (DT the) (NN ocean)))))))))))) (. .)))