Keith Dysart wrote:
And if I had meant *NET* I would have written "net".

Since you are talking about *NET* voltage, *NET*
current, *NET* energy, and *NET* power, don't you
think it would be wise to use the word *NET* (unless
your motive is to obscure)?

Since Pfor = Pref, then Pfor - Pref = 0

Isn't that superposition of power? Something that
most agree is not a legal operation.

No, that is simply an accepted engineering convention
that has been around since long before you and I
were born.

PLoad = (+Pfor) - (+Pref)

The negative sign doesn't mean negative power. It is
simply a directional convention for the Poynting vector
that indicates the direction of energy flow.

A negative sign is often used to denote direction (or
a 180 degree shift).

Dollars going into your bank account and coming out of
your bank account are all the same scalar dollars. The
direction in which they are flowing is denoted by a
plus or minus sign.
--
73, Cecil http://www.w5dxp.com