( ( ( relay electromechanical ) switch ) ( ( ( ( ( operated ( by ( ( a flow ) ( of electricity ) ) ) ) ( in ( one circuit ) ) ) and ) ( controlling ( ( the flow ) ( of ( electricity ( in ( another circuit ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (ADJP (RB relay) (JJ electromechanical)) (NN switch)) (VP (VP (VBN operated) (PP (IN by) (NP (NP (DT a) (NN flow)) (PP (IN of) (NP (NN electricity))))) (PP (IN in) (NP (CD one) (NN circuit)))) (CC and) (VP (VBG controlling) (NP (NP (DT the) (NN flow)) (PP (IN of) (NP (NP (NN electricity)) (PP (IN in) (NP (DT another) (NN circuit)))))))) (. .)))
relay electromechanical switch operated by a flow of electricity in one circuit and controlling the flow of electricity in another circuit.
(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))))))