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From: david on 19 Mar 2010 14:56
On Mon, 15 Mar 2010 17:27:27 -0700, metspitzer rearranged some electrons
to say:

> On Mar 15, 7:15 pm, John Doe <j...(a)usenetlove.invalid> wrote:
>> metspitzer<kilow...(a)charter.net> wrote:
>> >>metspitzer<kilowatt charter.net> wrote:
>> >> > Steve Stone <n2... hotmail.com> wrote:
>> >> >> John Doe wrote:
>> >> >> > he has ever actually measured the wattage a typical PC uses.
>> >> >> > Since he can buy a wattage meter "Kill-A-Watt" for $20 US,
>> >> >> > there is no excuse for any such "technician" to remain
>> >> >> > ignorant. If you buy a junk power supply, you might need 500 W,
>> >> >> > but you are still going to get a junk power supply that outputs
>> >> >> > garbage and could trash your system.
>>
>> >> >> Does a power supply that is rated at 500 watts equate to 500
>> >> >> watts input or 500 watts output?
>>
>> >> > It is both. Power input = Power output
>>
>> An electrical circuit wastes some electricity. I think the exact amount
>> of power that a power supply wastes is reflected in its efficiency
>> rating. If that number is 75%, the amount of power output is probably
>> 75% of the amount of power input.
>
> I bet my estimate of PF=1 is closer than your estimate of PF=.75

Power factor and efficiency are not the same thing. Go do some more
research.
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