This lecture covers the basics of electricity and the main concepts of oscillating mechanical systems. It explains how to convert mechanical systems into electrical equivalents using analogies. The course focuses on identifying mechanical elements, creating symbolic diagrams, and understanding the method of comparison. By differentiating between mechanical phenomena, it becomes possible to represent objects using analogy. The lecture also delves into the representation of basic mechanical elements, such as mass inertia and deformation, using symbolic diagrams. It illustrates the comparison between mechanical and electrical systems, emphasizing the importance of mobility method and analogies in understanding mechanical systems.