I'm not familiar with switched mode power supplies so hope this doesn't prove to be a dumb question. I dusted off an old '200 W' ex-PC power supply yesterday and was playing with it with a view to using it for some motor tests. (For the time being I settled on a set of 4 NiCads instead, but I may pursue it later.) Its spec says that its '5V' output is rated at 20A. Arbitrary tests gave me these results:
Current Voltage at load terminals
------- ------------------------- 5.1 A 4.77 7.5 A 4.51
11.0 A 4.20 13.0 A 4.02I didn't go further, but even at 13A isn't that voltage rather low? I wonder what it would drop to at close to 20A? What is regarded as an 'acceptable' voltage from the '5V' output of these types of supply please?