( ( Laws ( of physics ) ) ( ( ( tell us ) ( that ( Power ( can ( be ( obtained ( by ( multiplying ( ( Current and ) Voltage ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Laws)) (PP (IN of) (NP (NN physics)))) (VP (VBP tell) (NP (PRP us)) (SBAR (IN that) (S (NP (NNP Power)) (VP (MD can) (VP (VB be) (VP (VBN obtained) (PP (IN by) (S (VP (VBG multiplying) (NP (NNP Current) (CC and) (NNP Voltage))))))))))) (. .)))
Laws of physics tell us that Power can be obtained by multiplying Current and Voltage.
(ROOT (S (NP (NP (NNP Power)) (PP (IN in) (NP (NN electricity)))) (VP (VBZ is) (NP (NP (DT the) (NN voltage)) (VP (VBN multiplied) (PP (IN by) (NP (DT the) (JJ current)))))) (. .)))