Cathodic Protection Tester Practice Exam

What connects the rectifier positive terminal in an impressed current system?

1. To the structure being protected

2. To the ground bed

3. To the anodes

4. To the electrolytic cell

The correct answer is: To the anodes

In impressed current cathodic protection systems, the rectifier plays a crucial role in converting alternating current (AC) to direct current (DC), which is then used to protect the metal structure from corrosion. The positive terminal of the rectifier is connected to the anodes. This connection is fundamental because the anodes are the components that release current into the electrolyte (such as soil or water), creating a protective cathodic current flow to the structure being protected. By connecting the positive terminal to the anodes, the system ensures that the current supplied effectively mitigates corrosion on the metal structure. This setup allows for a controlled and sustained output of protective current, which is essential in preventing corrosion and ensuring the longevity of the metal structures in various environments. Therefore, the positive connection to the anodes ensures the effectiveness of the impressed current system in combating corrosion.