29 May
2007
29 May
'07
9:11 p.m.
Mark Hull-Richter wrote:
On 5/29/07, Jim Perrin jperrin@gmail.com 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