A power supply with what percent regulation would have an output voltage that remains constant regardless of load variations?

A power supply with 0% regulation means that the output voltage remains completely stable and does not change as the load varies. In terms of regulation, this refers to the ability of the power supply to maintain its specified output voltage despite fluctuations in load current. If a power supply has 0% regulation, it indicates perfect voltage control—any changes in load do not produce any change in the output voltage.

In contrast, higher percentages of regulation, such as 10% or 50%, imply that the output voltage would experience some degree of fluctuation in response to changes in load. For example, a 10% regulated supply might see a voltage change of up to 10% during load changes, while 50% implies the voltage could change by as much as 50%. A regulation of 100% would not typically be used in this context, as it suggests that the output is completely variable and unpredictable with load changes.

Therefore, the characteristic of having constant output voltage across varying loads distinctly identifies the power supply with 0% regulation as the correct answer. This feature is essential for applications requiring reliable voltage for sensitive electronics, ensuring consistent performance under varying load conditions.