Re: HMC Question - UPS issues

- Larry

DeLong, Eric wrote:

Vern wins the prize!  Mho is indeed the old common term for units of
conductivity.....  It's also known today as siemens (S).

Vern, just what DO you do with all that useless knowledge? <g>  I'd guess
trivial pursuit is a piece of cake (or pie....) for you.

Eric DeLong
Sally Beauty Company
MIS-Project Manager (BSG)
940-898-7863 or ext. 1863

-----Original Message-----
From: Vern Hamberg [mailto:vhamberg@xxxxxxxxxxxxxxxxxxxxxxxxx]
Sent: Thursday, August 19, 2004 3:47 PM
To: Midrange Systems Technical Discussion
Subject: Re: HMC Question - UPS issues

Is that Larry, Curly, or Mho?

At 01:32 PM 8/19/2004, you wrote:

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