Re: HMC Question - UPS issues

[michaelr_41@xxxxxxxxxxxxxx]

That would be the Om...which is also the measure of inner tranquility.

On Thu, 19 Aug 2004 14:32:03 -0400, "Larry Bolhuis"
<lbolhuis@xxxxxxxxxx> said:
> 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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> 
> 
> 
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-- 
  
  michaelr_41@xxxxxxxxxxxxxx