Solve for I (complex solution)
\left\{\begin{matrix}I=-R^{-\frac{1}{2}}\sqrt{P}\text{; }I=R^{-\frac{1}{2}}\sqrt{P}\text{, }&R\neq 0\\I\in \mathrm{C}\text{, }&P=0\text{ and }R=0\end{matrix}\right.
Solve for I
\left\{\begin{matrix}I=\sqrt{\frac{P}{R}}\text{; }I=-\sqrt{\frac{P}{R}}\text{, }&\left(P\geq 0\text{ and }R>0\right)\text{ or }\left(P\leq 0\text{ and }R<0\right)\\I\in \mathrm{R}\text{, }&P=0\text{ and }R=0\end{matrix}\right.
Solve for P
P=RI^{2}
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