( ( ( Electrical energy ) ( to ( ( light energy ) ( -LRB- ( ( light bulb ) -RRB- ) ) ) ) ) . )
(ROOT (NP (NP (JJ Electrical) (NN energy)) (PP (TO to) (NP (NP (JJ light) (NN energy)) (PRN (-LRB- -LRB-) (NP (JJ light) (NN bulb)) (-RRB- -RRB-)))) (. .)))
Electrical energy to light energy (light bulb).
(ROOT (S (NP (DT A) (JJ light) (NN bulb)) (VP (VBZ converts) (NP (JJ electrical) (NN energy)) (PP (TO to) (NP (JJ light) (CC and) (JJ thermal) (NN energy)))) (. .)))