( ( When ( electricity ( flows ( through ( a wire ) ) ) ) ) ( , ( ( the wire ) ( ( ( heats up ) ( because ( of ( ( its resistance ) ( to ( ( the flow ) ( of ( electrical current ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NN electricity)) (VP (VBZ flows) (PP (IN through) (NP (DT a) (NN wire)))))) (, ,) (NP (DT the) (NN wire)) (VP (VBZ heats) (PRT (RP up)) (PP (RB because) (IN of) (NP (NP (PRP$ its) (NN resistance)) (PP (TO to) (NP (NP (DT the) (NN flow)) (PP (IN of) (NP (JJ electrical) (NN current)))))))) (. .)))
When electricity flows through a wire, the wire heats up because of its resistance to the flow of electrical current.
(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.