( ( As ( an ( electrical term ) ) ) ( , ( it ( ( is ( ( an abbreviation ) ( for ( Direct current ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN As) (NP (DT an) (JJ electrical) (NN term))) (, ,) (NP (PRP it)) (VP (VBZ is) (NP (NP (DT an) (NN abbreviation)) (PP (IN for) (NP (JJ Direct) (NN current))))) (. .)))
As an electrical term, it is an abbreviation for Direct current .
(ROOT (S (NP (VBG Alternating) (NN current)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (JJ electric) (NN current))) (SBAR (WHNP (WDT that)) (S (VP (VBZ keeps) (S (VP (VBG reversing) (NP (NN direction))))))))) (. .)))