There is a current $I$ in a resistor of resistance $R$. The potential difference (p.d.) across the resistor is $V$.
Which equation gives the power $p$ dissipated by the resistor?
1 )
$P = IR$
$P = IV$
3 )
$P = \frac{I}{R}$
4 )
$P = \frac{I}{V}$
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