In an impressed current system, the rectifier positive terminal is connected to:

In an impressed current cathodic protection system, the rectifier converts alternating current (AC) to direct current (DC) for the purpose of protecting the structure from corrosion. The positive terminal of the rectifier is connected to the structure being protected because this is where the impressed current will be applied.

When the positive terminal is connected to the structure, it allows for effective distribution of current throughout the surface of the structure, preventing corrosion by ensuring that sufficient protective current flows to mitigate the electrochemical reactions that cause corroding. This setup helps maintain the potential of the structure in a more cathodic state relative to the surrounding electrolyte, which is essential for effective corrosion protection.

Understanding the role of the rectifier and its connections in an impressed current system is critical for proper implementation and maintenance of cathodic protection systems to ensure longevity and effectiveness in corrosion control.