The equation $R=\dfrac{P}{I^2}$ gives the resistance, $R$, in terms of the power, $P$, and the current, $I$, of an electrical system. Which of the following expressions gives $I$ in terms of $P$ and $R$ ?

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$$R = \frac{P}{I^2}$$ $$I^2 = \frac{P}{R}$$ $$I = \boxed{\sqrt{\frac{P}{R}}}$$