Does higher wattage power supply equal higher electricity drain????

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just for laughs i decided to go down into my workshop and run a few
tests since i have a 150watt and a 300watt supply down there

i loaded them down (one at a time) with the same two harddrives...
presenting a load low enough to probably be in the range of the psu's
worst efficiency

the 300 watt supply actually did draw about 0.05a more than the 150 watt
supply. ( i used a regulated 115v.a.c. supply)
being that they were not of the same design and had different cooling
fans i think that the 50ma could be considered insignificant...
especially considering that if in use 24/7 it would be a 15cent
difference in electric bill *per year*
Click to expand...

Did the two have the same power factor?
 
Ken said:
Did the two have the same power factor?
Click to expand...

What do you mean by power factor? Tell us your conception of that term,
and how it relates to cost to run a PS, especially at very low current
levels. The whole subject is in the noise level!

Hint: Do you know the difference between VAR and Watts?

Virg Wall
 
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