The mathematical model of the temporary dispersion of electromagnetic waves in the plasmo-like media, the dielectrics and the magnetic materials with the use not of the effective frequency-dependent, and not depending on the frequency physical quantity of dielectric and magnetic constant for the case of isotropic medium with the sizes, the much large of the size of the heterogeneity of field is developed (wavelength). This becomes possible due to the calculation of the kinetic inductance of charges and their kinetic capacity on the basis of the deep understanding of the physical sense of the dispersion as a result of the attraction of the methodological approaches, borrowed from electrical engineering. It is shown that in the case indicated the traditionally utilized in the electrodynamics effective dielectric constant can be expressed through several physical quantities, which do not depend on the frequency.