\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}