( Superconductors ( , ( however ( , ( ( ( ( can ( ( conduct electricity ) ( with ( zero ( electrical resistance ) ) ) ) ) and ) ( ( would therefore ) ( be ( vastly ( more efficient ) ) ) ) ) . ) ) ) ) )
(ROOT (S (NP (NNS Superconductors)) (, ,) (ADVP (RB however)) (, ,) (VP (VP (MD can) (VP (VB conduct) (NP (NN electricity)) (PP (IN with) (NP (CD zero) (JJ electrical) (NN resistance))))) (CC and) (VP (MD would) (ADVP (RB therefore)) (VP (VB be) (ADJP (RB vastly) (RBR more) (JJ efficient))))) (. .)))
Superconductors, however, can conduct electricity with zero electrical resistance and would therefore be vastly more efficient.
(ROOT (S (NP (PRP You)) (VP (VBP call) (S (NP (NNS materials)) (ADJP (JJ able) (S (VP (TO to) (VP (VB conduct) (NP (NN electricity)) (PP (IN with) (NP (ADJP (CD 100) (NN %)) (NN efficiency))) (, ,) (S (VP (VBG meaning) (SBAR (IN that) (S (NP (DT no) (NN energy)) (VP (VBZ is) (VP (VBN lost) (PP (IN during) (NP (NP (DT the) (JJ electrical) (NN transmission)) (, ,) (NP (NNS superconductors)))))))))))))))) (. .)))
You call materials able to conduct electricity with 100% efficiency, meaning that no energy is lost during the electrical transmission, superconductors.