Yeh, EMT, I have done some poking around and it appears that you may be wrong on figuring the wattage. I have went to two or three sites, and they all say that P=V*I no matter if it is AC or DC. The way that I have learned and always believed is the only difference between the two is the way that the electricity is transmitted. Electricity always goes from the power source to the ground. So DC is a direct route from the power pole goes through whatever circuitry, and then grounds out. And EMT, I have also called a friend, and he said that the power actually ocsilates between ~170 and ~-170 volts, and the rms of that is between 110-120 depending on what the peak voltages are.

The way I was taught ac, was that the power and negative are on one pole, and they share a common ground, which the common term comes from 3 phase power, because all of the 3 phases share one common ground. Anymore than that I do not really know.