1. The problem statement, all variables and given/known data An electric current described by I = 12 sin(250t) flows through a 20 ohm resistor. Calculate the power dissipated as heat. 2. Relevant equations V=IR P=IV P = I^2*R 3. The attempt at a solution Using the last equation, P = I^2*R P = 2880 sin^2(250t) Is that the best answer I can give? The question gives no information about efficency so I'm not sure if I'm forgetting an equation or something. It doesn't give a value for time either.