The basic concepts of the theory of electrical engineering and electronics are considered. Analysis and calculation methods of single-phase and three-phase electric circuits are given; nonlinear and magnetic circuits; transients in electrical circuits. The basics of the theory of electrical transformers and electrical machines, their main characteristics are given. The element base of modern industrial electronic devices, amplifiers of electric signals, power supplies, digital devices and the basics of microprocessor technology are considered. Designed for students of technological and technical higher educational institutions.