Terminal, usually in the form of a wire (see Conductor), rod, or plate, through which electric Current passes between Metallic and nonmetallic parts of an Electric Circuit. The electrode through which current passes from the metallic to the
nonmetallic conductor is called the Anode; that through which current passes from the nonmetallic to the metallic
conductor is called the Cathode. An electrode may be made of a metal, e.g., Copper, Lead, Platinum, Silver, or Zinc, or of a nonmetal, commonly Carbon.