# How much power is produced if a voltage of 4 V is applied to a circuit with a resistance of 4 Omega?

Mar 6, 2018

THe power is $= 4 W$

#### Explanation:

The voltage is $U = 4 V$

The resistance is $R = 4 \Omega$

The power is

$P = U I$

and Ohm's Law is

$U = R I$

$I = \frac{U}{R}$

Therefore,

$P = U I = U \cdot \frac{U}{R} = {U}^{2} / r = {4}^{2} / 4 = 4 W$