Y'all gotta r'call things are taught kinda differnt in Texas. I never
had a professor tell me that any concept was "useless as tits on a boar
hog", as Cecil's professor told him about instantaneous power. And that
admonition sure did stick with him, you might say like a fly on . . .

Roy Lewallen, W7EL

Tom Bruhns wrote:
Roy Lewallen wrote in message ...

W5DXP wrote:

Roy Lewallen wrote:


p(t) = v(t) * i(t). Period. No phase, no vectors, no cross products.


Millions of power engineers have been taught that V*I*cos(theta) is power.
Are you disagreeing with that teaching?

Yes.


Yes, indeed. The power engineers who have to deal with electronic
power supply loads are quick to realize that sine waves aren't enough
for them. Things have changed in that regard since the 50's. It
became such a problem that there are now requirements for power factor
correction (or more accurately, for a maximum power factor, and
maximum harmonic content).

Cheers,
Tom