When the component obeys ((V = IR)), where (R) is constant resistance, we can derive two additional, situationally useful forms. Substituting (V = IR) into (P = IV) yields:
Alternatively, substituting (I = V/R) gives: Ib Physics 5.2
Since energy ((E)) is power multiplied by time, the electrical work converted into heat over time (t) is (E = IVt). When the component obeys ((V = IR)), where