# How much power is produced if a voltage of 10 V is applied to a circuit with a resistance of 300 Omega?

$\frac{1}{3} W$
We are given that $V = 10 V$ and that $\Omega = 300 \Omega$. We know that $P = {I}^{2} R$, and we also know that $V = I R$. Using these two things, we can deduce that $P = {V}^{2} / R$, and when we plug in the numbers, we get:
$P = {\left(10 V\right)}^{2} / \left(300 \Omega\right) = \frac{100}{300} = \frac{1}{3}$