Re: DATACENTER: computing KW-hours from AC current

[db@warp.net (David Bartlett)]

>
>David,
>
>I thought the calculations were complicated for alternating current,
>but apparently this is apparently not the case.  Thanks very much for 
>your response.
>
>Peter Polasek
>

Peter,

The calculation of power in an AC circuit certainly can be more complicated.

Apparent Power can be calculated by: P=EI

but true power requires: P=EI cos theta = EI * P.F. (power factor)

where theta is the phase angle between E and I

Power Factor F.F. =P/IE = cos theta

or 

cos theta = true power/apparent power

I find that apparent power fits for the calculation you require.

Besides, cosines make me dizzy. :)

db

David Bartlett                              db@warp.net
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