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Hi Kone,

Modern digital oscilloscopes can do those calculations on the fly. If having the multiplication function the curve of power can be shown. If also able to integrate the power curve a curve representing the energy transfer can be shown.

I've heard of the paper method where the areas are cut out and weighed instead of counting the area when knowing the mass per area of the paper.

Regards
Ole
 

---In [email protected], <konehead@...> wrote :

 Hi Ole an dSven
 A group of 4 electrical engineers at a science meeting I was at many years ago (a Bill Beatty weird science meeting) was approached and asked by me how to do accurate real-power measurements for a DC pulsed "konehead" motor that I brought to the meeting.....they thought about it and talked about it for awhile, and then said this to me, and I would assume it would work in AC too:
 On graph paper, make an exact drawing of how the voltage looks on scope....
 On the same graph paper, but translucent type, make another exact drawing of how the current looks on scope....
 Lay the translucent graph paper (current) on top of the other piece of graph paper...line up the small graph squares so it sits on top perfectly.
 With pencil or pen, shade-in the areas where current ovelaps the voltage, then after that, calculate how much power the shaded-in area represents...
 ciaoKone