Complex analytical investigation of electrification processes on the basis of Maxwell's Electrodynamics and investigations of currents passing through the liquid are carried out. The main peculiarities of electrification and qualitative features of current-voltage characteristics which permit to determine the type of electrification are obtained. The main stages of the process of electrification are as follows: low voltage heteropolarization at I = 0, 0 кр 0 <U <U , Ohm law region and local electrical neutrality of the liquid at j = σE и 0 кр кр U <U <U′ , saturation region and heterocharge high voltage polarization at н I = I =const, кр кр U′ <U <U′′ , prebreakdown stage of quick nonlinear increase of current at кр U >U′′ , homocharge electrification, EHD–phenomena, breakdown.