Power Consumption

[James Knott]

Madison Kelly wrote:
> Keep in mind that switching power supplies are not 100% efficient. They
> tend to be most efficient at around 75% of their maximum draw (225w draw
> on a 300w PSU). Even at that they tend to be 65% efficient (though the
> quality of your PSU could vary this a lot). Sooo... If even if you have
> peak efficiency drawing 225w with 65% efficiency you will be pulling
> roughly 300+w (someone correct me if my math is wrong).
> 
> The concept is there though, a 300w PSU draws more than 300w from the
> mains at 100% load.

No.  The rating is the maximum power drawn, not the amount delivered to
the load.
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