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.
I knew that (duh!).
Watts = Volt-Amps IF the power factor is =1. Power factor is based on
the reactance of the load. A purely resistive load has a PF=1. Google
<< watts vs volt-amps >> for more info, e.g.
http://www.vabiomed.org/documents/tech0003.htm.
The power supplies I have measured in servers have a power factor close
to 1. But I have measured consumer machines with a power factor
considerably different than 1. That cute little power meter mentioned
earlier in this thread (the "Kill-a-Watt") will measure it.
Dan
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