( ( A ( series circuit ) ) ( ( is ( ( a circuit ) ( that ( makes ( the ( electricity ( flow ( one way ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN series) (NN circuit)) (VP (VBZ is) (NP (NP (DT a) (NN circuit)) (SBAR (WHNP (WDT that)) (S (VP (VBZ makes) (NP (DT the) (NN electricity) (NN flow) (CD one) (NN way))))))) (. .)))
A series circuit is a circuit that makes the electricity flow one way.
(ROOT (NP (NP (NP (DT A) (JJ parallel) (NN circuit)) (VP (VBZ is) (VP (RBS best) (VBN described) (PP (IN as))))) (: :) (NP (NP (NN electricity) (NNS flows)) (PP (IN along) (NP (QP (JJR more) (IN than) (CD one)) (NN pathway))))))