This part of IEC 60050 gives the general terminology used in the theory of electric and magnetic circuits@ as well as general terms pertaining to circuit elements and their characteristics@ to network topology@ to n-port and two-port networks@ to methods of circuit theory.This terminology is of course consistent with the terminology developed in the other specialized parts of the IEV.The section on polyphase circuits@ which was existing in the first edition ??Electric and magnetic circuits??@ will be expanded in a separate part of IEC 60050.