The book provides basic concepts about the elements of electrical and magnetic circuits. Explain the physical processes occurring in these circuits. The method of their calculation is described .. The book contains basic information about electrostatics and electromagnetic induction, about the action of electric current, constant and alternating current, about electrochemistry. The material is presented in a simple and accessible language using only the simplest mathematical apparatus. The book contains more than 1000 drawings, 340 numerical examples for calculations, 1200 tasks and 1000 questions for self-testing. Recommended for high school students, students and teachers of secondary and higher education institutions, students of advanced training courses, as well as for self-study.