Re: HMC Question - UPS issues

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.
> >  
> >
> -- 
> Larry Bolhuis                   IBM eServer Certified Systems Expert:
> Vice President                    iSeries Technical Solutions V5R2
> Arbor Solutions, Inc.             iSeries LPAR Technical Solutions V5R2
> 1345 Monroe NW Suite 259          iSeries Linux Technical Solutions V5R2
> Grand Rapids, MI 49505            iSeries Windows Integration Technical 
> Solutions V5R2
>                                 IBM eServer Certified Systems Specialist
> (616) 451-2500                    iSeries System Administrator for 
> OS/400 V5R2
> (616) 451-2571 - Fax              AS/400 RPG IV Developer
> (616) 260-4746 - Cell             iSeries System Command Operations V5R2
> 
>   If you can read this, thank a teacher....and since it's in English, 
> thank a soldier.
> 
> 
> 
> --
> This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing
> list
> To post a message email: MIDRANGE-L@xxxxxxxxxxxx
> To subscribe, unsubscribe, or change list options,
> visit: http://lists.midrange.com/mailman/listinfo/midrange-l
> or email: MIDRANGE-L-request@xxxxxxxxxxxx
> Before posting, please take a moment to review the archives
> at http://archive.midrange.com/midrange-l.
> 
-- 
  
  michaelr_41@xxxxxxxxxxxxxx