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It certainly applies to both that's for sure. What I seem to recall is that the reason that VA is not the same as Watts exactly is because of the sine wave nature of AC current. The available power is only the area under the curve. The voltage we normally speak about is RMS (root mean square) voltage not peak voltage. RMS gives a pretty decent approximation of the power that would be available if we had square wave power at the stated voltage (as some older UPSs used to generate when on batteries) The peak voltage of an AC circuit is higher than RMS voltage and I believe the differnce is that between VA and Watts.

- Larry

ps: If the Ohm is the unit of measure of resistance, what is the unit of measure of conductance?

daparnin@xxxxxxxxxxxxxxxxxx wrote:



This goes back a few years, but isn't Ohm's Law only applicicable to DC,
not AC.  Hence, they came up with volt-amps as a means of expressing the
power requirements.  I sat through an American Power seminar 10 or 12 years
ago where they explain what it was all about.  Unfortunately, you use it or
loose it.  ...and I'm loosing it (along with some of my hair).

Dave Parnin
Nishikawa Standard Company
Topeka, IN  46571
daparnin@xxxxxxxxxxxxxxxxxx




UPS' have ratings of vA (volt-amps). These seem similar to watts - remember
PIE (Ohm's Law)? P = I x E (P = power in watts, I = current in amps, E =
voltage in volts). It may not be completely accurate, but I find the load
for each unit attached to the UPS - it's usually on a label in back. Add'm
up. You probably want to worry about peak vs. average. I'm sure others have
more info, and the manuals (perish the thought of RTFM) have guidelines for
all this.


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