Question

A charge of `24 C` passes through a circuit every `12 s`. If the circuit can generate `36 W` of power, what is the circuit's resistance?

Answer 1

`9Omega`

Explanation:

Current is given by

`I = Q/t = (24C)/(12s) = 2A`

and power by

`P=IV = I^2R`,

so

`R = P/I^2 = 36/2^2 = 9Omega`