The book is the third part of a set of educational literature on the theory of electrical circuits for communication technical schools (the first two parts - a textbook and a laboratory workshop by the same author were published in 1990 and 1991, respectively). The chapters and sections of this collection of problems fully correspond to the chapters of the textbook. More than 40% of the tasks are provided with explanations and various methodological instructions. A large number of programs for a programmable microcalculator are given, which greatly facilitate mathematical calculations. There are assignment options for individual lessons. For students of technical colleges of all specialties.