( ( Electrical energy ) ( ( is ( converted ( into ( ( light energy ) ( in ( the headlights ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Electrical) (NN energy)) (VP (VBZ is) (VP (VBN converted) (PP (IN into) (NP (NP (JJ light) (NN energy)) (PP (IN in) (NP (DT the) (NNS headlights))))))) (. .)))
Electrical energy is converted into light energy in the headlights.
(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)))) (. .)))