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