A power supply that maintains a constant output voltage regardless of load would have what percent of regulation?

A power supply that maintains a constant output voltage regardless of load would have zero percent regulation. This is because regulation in this context refers to the ability of the power supply to keep its output voltage stable despite fluctuations in the load current. If the output voltage remains unchanged when the load varies, it indicates that the supply is functioning ideally without any deviation in output voltage due to changes in load.

Zero percent regulation signifies that there is no change in output voltage when there is a change in load, which reflects the perfect performance of the power supply in maintaining its specified output. In practical terms, realistic power supplies may have some degree of variation (non-zero regulation) due to internal resistance and other factors, but the concept being tested here is the ideal scenario where regulation is perfect.