1. The problem statement, all variables and given/known data The peak value of an alternating current in a 1500W device is 5.4A. What is the rms voltage (root-mean-square voltage)across it? 3. The attempt at a solution Peak current=sqrt(2)*Irms 5.4A=sqrt(2)*Irms Irms=3.82A Irms=P/Vrms 3.82=1500/Vrms Vrms=392.84V I am not sure whether this is the correct way to do the question or not, because it seems to simple...Any comment/help would be great. Thank you very much.