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