\begin{equation} V = IR \end{equation}
where, V is the voltage across the resister, I the current, and R the resistance. power (physics) the rate at which electrical energy dissipates into heat is called power:
\begin{equation} P = IV \end{equation}
where, P is power, and I the current, and V the voltage. Alternate formulation of power:
\begin{equation} P = I V = \frac{V^{2}}{R} = I^{2} R = \dv{E}{t} \end{equation}