> >Think of it this way:  What if the load was a large capacitor.  The power
> >average power into the load must be zero, but there is still significant
RMS
> >current and voltage.
>
> Yes, but was that a capacitor ?

That's the point.  You don't know the characteristics of the load.  Your
method will only work if the load is resistive, which may be a rather bad
approximation.

> Because of course I did not use it for a
> capacitor, at least not directly.


*****************************************************************
Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics