( ( ( ( ( ( Conductors ( have ( low resistance ) ) ) , ) ( metals ( are conductors ) ) ) and ) ( that ( is ( why ( they ( are ( used ( in ( electrical wiring ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNS Conductors)) (VP (VBP have) (NP (JJ low) (NN resistance)))) (, ,) (S (NP (NNS metals)) (VP (VBP are) (ADJP (JJ conductors)))) (CC and) (S (NP (DT that)) (VP (VBZ is) (SBAR (WHADVP (WRB why)) (S (NP (PRP they)) (VP (VBP are) (VP (VBN used) (PP (IN in) (NP (JJ electrical) (NN wiring))))))))) (. .)))
Conductors have low resistance, metals are conductors and that is why they are used in electrical wiring.
(ROOT (S (PP (IN In) (NP (NP (NN relation)) (PP (TO to) (NP (JJ electrical) (NN current))))) (, ,) (NP (DT a) (JJ narrow) (NN wire)) (VP (MD will) (VP (VB have) (NP (JJR more) (NN resistance)) (PP (IN than) (NP (DT a) (JJ wide) (NN wire))))) (. .)))
In relation to electrical current, a narrow wire will have more resistance than a wide wire.