On Jun 5, 6:33*pm, Keith Dysart wrote:
This simplified form works for sinusoids. It is derived from
P(t)=V(t)I(t),
but loses information since the result is just the average value.

Note that P(t)=V(t)I(t) is just Pfor(t) - Pref(t) which loses
information when the subtraction is performed and is not important in
any meaningful way. If, as you say, loss of information is to be
avoided, you should be using Pfor(t) and Pref(t) instead of net P(t).
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73, Cecil, w5dxp.com