RE: [LUG] UPS, reprise

[andy@xxxxxxxxxxxxxxxxxxxxxx]

P.J.Weaver@xxxxxxxxxxxx wrote:
> > ===== Original Message From Steve Marvell <steve@xxxxxxxx> =====
> > PS did we ever find out what was going to go on the end of that 15KVA
> > jobby?
>
> I was reading a rag with ups's in, and it said something like "to convert 
> watts to VA, multiply by 1.4". Is this a ploy to sell more expensive UPS's, as 
> if I remember correctly, Power (W) == Volts (V) * Amps (A)

Watts is 'true' power (The proportion of the current in line with the voltage)

VA is 'apparent' power (V*A)

the difference is the 'power factor' (I think electricity companies have to deliver 
a power factor of around 0.8 which ties in with 1.4 going the other way)

--Andy Weir-------------------------------------------------------------
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