Question

A 36 Ω component is connected to a 12 V battery. How much energy is expended per second? answer in:______W

Answer 1

In order to calculate the power consumed by the component, we can use the formula below:

$P=\frac{V^2}{R}$

If the voltage is 12 V and the resistance is 36 ohms, the power is:

$P=\frac{12^2}{36}=\frac{144}{36}=4\text{ W}$

Therefore the power (energy per second) is 4 W.