Question

How much power is produced if a voltage of `8 V` is applied to a circuit with a resistance of `2 Omega`?

Answer 1

`P = V^2/R`

Explanation:

Ohm's Law states that V = IR, and P = VI.
So, `P = I^2*R *and* P = V^2/R`
Calculate the circuit current from the first equation, and then calculate the power from the second equation.
I = V/R ; P = V*V/R or `P = V^2/R`