( ( ( The ratio ) ( of ( voltage ( to current ) ) ) ) ( ( is ( called ( ( R , ) ( ( the ( electrical resistance ) ) ( of ( the wire ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN ratio)) (PP (IN of) (NP (NP (NN voltage)) (PP (TO to) (NP (JJ current)))))) (VP (VBZ is) (VP (VBN called) (NP (NP (NN R)) (, ,) (NP (NP (DT the) (JJ electrical) (NN resistance)) (PP (IN of) (NP (DT the) (NN wire))))))) (. .)))
The ratio of voltage to current is called R, the electrical resistance of the wire.
(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.