DIYbanter - View Single Post

wrote:

The power formula you have is for a three phase AC load. For a pure
resistance load, eg a simple load like a heater, the voltage and
current are always in line with each other. If you drew graphs of the
two, and placed one over the other, they would line up perfectly.

The formula works just as well for single phase power.
Your description is quite correct for any number of phases.

Bill Gill