Re: AVERAGE Power/Phase angle confusion

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "harvey norris by way of Terry Fritz <twftesla-at-uswest-dot-net>" <harvich-at-yahoo-dot-com>


--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "Gary Johnson by way of Terry Fritz
> <twftesla-at-uswest-dot-net>" <gjohnson-at-ksu.edu>
> 
> Sorry to pick nits, but a recent reference to RMS
> power set me off, rather
> like fingernails on a slate blackboard.  Our meters
> measure measure average
> voltage and current on the dc ranges, rms voltage
> and current on the ac
> ranges, but only AVERAGE power (never RMS power).
Are not these the same thing? If we integrate the
Power equation curve for a half cycle is not the area
under this curve the sime area as if the rms voltage
and rms amperages were multiplied?
> Average power is the
> product of rms voltage, rms current, and power
> factor. 
I definitely disagree here. If you are making AC
MEASUREMENTS on any circuit, those measurements
themselves are already the result of the phase angle
conditions. If I am measuring a fairly resonant
circuit the amount of rms amperage times the impressed
rms voltages IS the power input. In that case the
power factor is near 1, but that does not enter into
the equation. The power input is merely the measured
rms amperage and voltage values in multiplication,
assuming a sinusoidal AC input. Near resonance the
amount of power input comes close to the value of
conduction enabled by ohms Law. BY taking the capacity
out of the circuit, the recorded amperage will go
down, so now the meter reads the amount of reactive
current present in the inductance. It is THAT rms
amperage reading of that reactive current that has
already been reduced by its now large phase angle,
making a low power factor. The Power factor itself is
not further multiplied by the previous multiplications
of (measured,not predicted by OHMS LAW) voltages and
amperages to derive the power input. By having the
extra multiplication you are essentially "factoring in
the power factor twice instead of once." I cannot
believe how many times this power factor nonscense is
misinterpreted. Once again,(it is my belief unless
someone can explain otherwise); THE POWER FACTOR IS
THE CAUSE OF OUR METER MEASUREMENTS, NOT A FACTOR THAT
NEEDS TO BE MULTIPLYIED AGAIN TO ASCERTAIN THE TRUE
POWER INPUT.

Sincerely HDN



It is possible to
> mathematically define a quantity called rms power,
> but it has no physical
> meaning that I know about.
> 
> Gary Johnson
> 
> 
> 


=====
Binary Resonant System  http://members3.boardhost-dot-com/teslafy/

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