When an electric current flow in a closed electric circuit consisted of the electronic conductors and the ionic conductors, it is of great importance in the development of electrodynamics to clarify exactly how an electric current flows and why a material change occurs at the junctions (electrodes) of two conductors.In a closed electric circuit consisted of an electronic conductor and an ionic conductor, it has been studied that the material changes at the electrode interface, which are the junctions of the two conductors under direct current, are not chemically but electromechanically induced material changes, and that these material changes are electromechanical material changes due to charge and discharge that are fundamentally different from the chemical redox reaction［1］.In [2], new principles of cell and electroplating have been investigated.In this paper, we demonstrated that in the circuits consisted of the electronic and the ionic conductor, the material change phenomena that occur at the junction (electrode) between the conductors under direct current are not chemical reactions, but electrical material change by the current conversion.