Workshop. — SPb. : Federal Agency for Education St. Petersburg State Polytechnic University, 2012. — 111 s. The book is devoted to the basic equations for the mathematical description of processes in energy and electrophysical equipment .. The methods of finding device parameters, setting boundary conditions and working with the Comsol Myltuphysics software complex are briefly described. The manual is intended for students of 2-3 courses studying the disciplines "Computer Technology" and "Mathematical Models" . The manual corresponds to the state educational standard of bachelor's training in the direction of 140400 "Electric Power Engineering and Electrical Engineering" in the profile "High-Voltage Electric Power Engineering and Electrical Engineering".