# How much power is produced if a voltage of 10 V is applied to a circuit with a resistance of 400 Omega?

##### 1 Answer
Apr 7, 2016

$p = {v}^{2} / r \left({10}^{2} / 400\right) = 0.25 W$

#### Explanation:

basically power is the product of voltage and current but after interchanging you can express it in terms of voltage and
once you work it out it should give you o.25 watts