If a current of 7 A passing through a circuit generates 9 W of power, what is the resistance of the circuit?

$R = \frac{9}{7} ^ 2 \approx 0.18 \Omega$
$P = {I}^{2} R$
$9 = {7}^{2} R$
$R = \frac{9}{7} ^ 2 \approx 0.18 \Omega$