In relation to cathodic protection, which component reduces corrosion by forcing electrons towards the cathode?

The correct choice, which identifies the component that reduces corrosion by forcing electrons towards the cathode, is the power supply. In cathodic protection systems, especially those using impressed current, the power supply plays a crucial role in providing the necessary direct current to the electrodes. This current flows from the anode to the cathode, effectively polarizing the cathode and reducing its potential for corrosion.

By supplying electrons directly to the cathode, the power supply enhances the electrochemical reactions that occur at the cathode, which ultimately promotes a reduction reaction that counters the oxidation of metal at the anode. This method is particularly effective in protecting buried pipelines, storage tanks, and other structures exposed to corrosive environments, as it actively suppresses the corrosion process.

In contrast, the other components mentioned do not directly force electrons to the cathode in the same way. For instance, the reference electrode is used to measure the potential difference and determine the effectiveness of the cathodic protection but does not actively contribute currents. Corrosion inhibitors are chemical substances that can slow down corrosion but do not provide a mechanism of electron flow like a power supply does. The annular shield is a design feature that helps to improve current distribution but does not supply current itself. Understanding