( ( With ( a ( periodic signal ) ) ) ( , ( power ( ( refers ( to ( ( the ( electrical energy ) ) ( of ( ( a ( signal spectrum ) ) ( computed ( by ( multiplying ( ( frequency times ) amplitude ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN With) (NP (DT a) (JJ periodic) (NN signal))) (, ,) (NP (NN power)) (VP (VBZ refers) (PP (TO to) (NP (NP (DT the) (JJ electrical) (NN energy)) (PP (IN of) (NP (NP (DT a) (NN signal) (NN spectrum)) (VP (VBN computed) (PP (IN by) (S (VP (VBG multiplying) (S (NP (NN frequency) (NNS times)) (ADJP (JJ amplitude)))))))))))) (. .)))
With a periodic signal, power refers to the electrical energy of a signal spectrum computed by multiplying frequency times amplitude.
(ROOT (S (NP (NP (JJ Electrical) (NN energy)) (VP (VBN consumed))) (VP (MD can) (VP (VB be) (VP (VBN expressed) (PP (IN as) (NP (NP (DT the) (NN product)) (PP (IN of) (NP (NP (NN power)) (VP (VBN multiplied) (PP (IN by) (NP (NN time))))))))))) (. .)))