Richard Harrison wrote:

Keith wrote:
"The last is true, but p(t) = v(t)*i(t); volts and amps must be present
simultaneously for there to be power."

By the same token, a-c flow is discontinuous at all zero crossings! I
don`t think so.

There is certainly no power at the zero crossings. This variation in
the rate of energy flow is why the power dudes really prefer 3 phase;
energy flow is constant.

....Keith