( ( Mr. Andersen ) ( ( contrasts ( ( ( ( series and ) ( parallel ( electrical circuits ) ) ) . ) ( ( A simulation ) ( is ( used ( to ( ( visualize ( electron flow ) ) ( through ( both ( circuit types ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Mr.) (NNP Andersen)) (VP (VBZ contrasts) (NP (NP (NP (NN series)) (CC and) (NP (JJ parallel) (JJ electrical) (NNS circuits)) (. .)) (SBAR (S (NP (DT A) (NN simulation)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB visualize) (NP (NN electron) (NN flow)) (PP (IN through) (NP (DT both) (NN circuit) (NNS types)))))))))))) (. .)))
Mr. Andersen contrasts series and parallel electrical circuits.  A simulation is used to visualize electron flow through both circuit types.
(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))))))