( They ( ( ( ( shut down ) ( the ( electrical current ) ) ) ( before ( ( ( the heat ) ( generated ( by ( ( the ( wire 's ) ) resistance ) ) ) ) ( is ( enough ( to ( ( burn ( the wire ) ) up ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD shut) (PRT (RP down)) (NP (DT the) (JJ electrical) (NN current)) (SBAR (IN before) (S (NP (NP (DT the) (NN heat)) (VP (VBN generated) (PP (IN by) (NP (NP (DT the) (NN wire) (POS 's)) (NN resistance))))) (VP (VBZ is) (ADJP (JJ enough) (S (VP (TO to) (VP (VB burn) (NP (DT the) (NN wire)) (PRT (RP up)))))))))) (. .)))
They shut down the electrical current before the heat generated by the wire's resistance is enough to burn the wire up.
(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.