Charge formation in the liquid dielectrics under the influence of electrostatic field is considered. Systematization of various types of electrization, their physical interpretation as well as mathematical description are presented. Mechanisms of electrization, which can be subdivided on equilibrium with and without taking into consideration diffusion currents, and non–equilibrium with and without taking into consideration diffusion currents, are discussed. It is shown that depending on media properties, external field and other factors one or another mechanism can be realized. Bipolar structures of space charge are explained, the results of numerical simulation of charge formation and current flow are given. Interconnection between media electrization and Ohm law is considered.