Keith Dysart wrote:
And P = V * I seems rather fundamental, so V or
I is always 0, then P must always be 0.

Make that *NET* power and you will be correct. There is
zero *NET* power transfer in pure standing waves.

Since Pfor = Pref, then Pfor - Pref = 0
--
73, Cecil http://www.w5dxp.com