( So ( clearly ( , ( ( ( the power ) ( dissipated ( by ( an ( electrical component ) ) ) ) ) ( ( is ( determined ( by ( multiplying ( ( ( the current ) ( ( through ( ( the component ) ( by ( ( the voltage ) ( across ( the component ) ) ) ) ) ) . ) ) ( ( ( The ( SI unit ) ) ( for power ) ) ( is ( ( the watt ) ( -LRB- ( W -RRB- ) ) ) ) ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (RB So) (ADVP (RB clearly)) (, ,) (NP (NP (DT the) (NN power)) (VP (VBN dissipated) (PP (IN by) (NP (DT an) (JJ electrical) (NN component))))) (VP (VBZ is) (VP (VBN determined) (PP (IN by) (S (VP (VBG multiplying) (SBAR (WHNP (NP (DT the) (JJ current)) (PP (IN through) (NP (NP (DT the) (NN component)) (PP (IN by) (NP (NP (DT the) (NN voltage)) (PP (IN across) (NP (DT the) (NN component)))))) (. .))) (S (NP (NP (DT The) (NNP SI) (NN unit)) (PP (IN for) (NP (NN power)))) (VP (VBZ is) (NP (NP (DT the) (NN watt)) (PRN (-LRB- -LRB-) (NP (NNP W)) (-RRB- -RRB-))))))))))) (. .)))
So clearly, the power dissipated by an electrical component is determined by multiplying the current through the component by the voltage across the component.  The SI unit for power is the watt (W).
(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)))))) (. .)))