How is a constant voltage rectifier normally adjusted?

A constant voltage rectifier is typically adjusted to maintain a steady output voltage, which is crucial in cathodic protection applications. The adjustment is most commonly achieved by modifying the secondary transformer taps. This method allows for precise control over the voltage output without requiring significant alterations to the entire power supply system.

Changing taps on a transformer effectively alters the output voltage depending on which tap is selected, facilitating adjustments to meet the specific requirements of cathodic protection systems. This approach is efficient, as it allows for adjustments without needing to replace components or make more invasive changes.

The other options do not provide the same level of control or efficiency. Changing the power supply may introduce complexities and affect overall system stability. Altering the anode size could impact the system's electrochemical dynamics rather than merely adjusting voltage output. Modifying current flow could potentially affect performance characteristics as well, but it does not directly lead to the desired adjustment of the output voltage in the same straightforward manner as adjusting transformer taps.