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How much electric do power supplies draw?

W

wesbay

Junior Member
I recently was told by someone that a 300 watt power supply draws a continuous 300 watts of electric from it's source. I did not think this is correct. I thought it was more like a transformer that draws as it's called upon based on what it's connected to. For example, when a system and monitor snooze, they draw less current but does the power supply also draw less from the grid when that happens? Does anyone know the correct awnser? TIA
 
This gets into the area of 'efficiency' and not all psu manufacturers publish this information. If you look at the data sheet for Antec's PP-303XP 300w P4 psu, their published efficiency is greater than or equal to 72%. Does this mean that when you are using the supply at it's maximum capacity (300w) that the 'mains' are supplying 416.67w? Maybe. It may be that when the supply is providing 'snooze' power, efficiency is at the minimum (72%) and when maximum load is required, efficiency may be greater. I would like to see several RKIs pick this up and educate us.

Anyone?
 


<< Excuse my ignorance, but are our computer power supplies all switching power supplies? thanx >>

Most all PC power supplies these days are switching power supplies. In fact, I don't know if you can get any other kind.
 
Thanks, so I was also wondering if anyone has ever figured out what their rig uses for wattage in it's standby mode minus the monitor.
 
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