Question

How much power is produced if a voltage of `4 V` is applied to a circuit with a resistance of `8 Omega`?

Answer 1

2 Watts

Explanation:

Since `P=VI` and by Ohm's law, `V=IR` and hence `I=V/R` then substituting we get

`P=V^2/R`

Hence Power = 16/8= 2W