Re: Power Measuring!! Need Assistance

In article <codtp11u3ip3c717i5e7e7cnok269kc0t9@xxxxxxx>,
theJackal <f_a_s_t_g_s_f_r_i_d_e_r@xxxxxxxxxxx> wrote:

> On Tue, 13 Dec 2005 15:51:14 +1100, "Phil Allison"
> <philallison@xxxxxxxxxx> wrote:
> >True Power = average value of V x I
> >
> >where V = instantaneous voltage and I = instantaneous current.


> Totally wrong! The average value of a sinusoidal waveform is
> Zero ... so according to your answer the True Power = 0!

Umm......

The product, Vinst*Iinst, is a sine wave which has
an average dc-value proportional to the true power.

The product only has an average value of Zero when
Iinst is exactly 90 degrees away from Vinst.
ie, When the load is a pure reactance, = zero power.

--
Tony Williams.
.