This edition is devoted to the detailed presentation of the section of physics "Electrostatics and the theory of direct electric current." The material is presented at an elevated level, although it is accessible to the understanding of students interested in physics. The book contains a number of historical information related to physicists and their discoveries. The book can help prepare for various physical olympiads - from school to international - and is intended for students of general secondary education institutions, and can also be useful to teachers and parents.