On Tue, 29 May 2007, Mark Hull-Richter wrote:
On 5/29/07, Jim Perrin <jperrin@xxxxxxxxx> wrote:
Watts = Volts x Amps. I usually use a sliding scale based on # of
machines.
That has to be the stupidest marketing strategy ever devised. Most
people (yeah, me too) know that, but why can't they SAY so instead of
using "VA"?...
This formula is correct for a resistive load; however, it completely
ignores the reactive load. The correct formula is:
watts = power_factor X volts X amps
You consume volt-amps, but can only use for amps. There are various
regulations in place regarding the minimum power factor -- decent power
supplies have a power factor of better than 90%.
Steve Friedman
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