In an impressed current system, to which terminal are the anodes connected?

In an impressed current cathodic protection system, the anodes are connected to the negative terminal of the power supply. This connection allows the anodes to become the source of electrons that will flow toward the structure being protected, effectively creating a protective current. Since the anodes are made from materials that are more easily corroded than the structure, they will corrode preferentially, thus protecting the structure from corrosion.

The reason for the negative terminal connection is associated with the fundamental principles of electrochemistry, where the flow of electrons goes from the anode (where oxidation occurs) to the cathode (where reduction takes place). By ensuring the anodes are linked to the negative terminal, it facilitates an effective and consistent protective current that reduces the likelihood of corrosion on the structure.

Understanding the role of the terminal connections in the impressed current system is vital for ensuring the proper functioning of a cathodic protection system. Other options may suggest various incorrect configurations or interpretations of the system operation that do not align with these principles.