Re: Power Consumption
Charles Scott (cscott@freeway.net)
Wed, 28 May 1997 17:28:52 -0400 (EDT)
Stephen:
The formula VA = WATTS * 1.4 is an approximation of real world
conditions by the manufacturer of a power backup equipment. (Keep in mind
that it's to their advantage that you over estimate your needs.)
The conversion from VA to Watts only has meaning if you have a specific
known "power factor". The power factor is the ratio of VA to Watts which
occurs when the current and voltage are out of phase. The phase
difference is dependent on the type of loads on the line. Plug something
different into the line and your power factor changes.
Chuck
On Tue, 27 May 1997, Stephen Fisher wrote:
>
> APC's web site (www.apcc.com) says VA = WATTS * 1.4, is this a more
> accurate measurement for 120V AC power?
>
> On Tue, 20 May 1997 thoth@purplefrog.com wrote:
>
> > > (1) Can someone remind me how to convert from amps and volts to Watts.
> >
> > Multiply amps times volts and you usually get Watts. However, in AC,
> > the two can be out of phase and some of those watts are "imaginary".
> ...
>
>