what is the purpose of Impressed Current cathodic protection? why do we measure the potential?

Answer 1

It is protection from corrosion. Metals corrode when their atoms lose electrons. A DC power source has its positive terminal attached to a ground rod. Then its negative terminal is attached to your underground pipe or other metallic object. This forces an excess of electrons on the metal so that the atoms cannot easily lose electrons.

The potential, also called voltage, must be adequate or the protection will not be adequate.

P.S. The ground rod must be replaced periodically because its corrosion is accelerated by the current.

Answer 2

what are the basic concept of science