[CentOS] wich apc ups?

[Chris Mason (Lists)]

Thomas Harold wrote:
> Actually, I think there's a technical reason why they don't say 1500W 
> instead of 1500VA.  A
Computers are not a passive load in the way that a heating element would 
be, they tend to have a very capacitive load characteristic. As a 
result, the voltage cycle and current cycle will be out of phase. This 
means that, while the voltage x amperage is equal to approx 1500W, there 
will not be 1500 watts of power delivered.

P=VxA only holds true if they are in phase and so using VA is correct.

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