The recent trend of digitalization of education is associated with a deeper introduction of computer modeling in the educational process. The study of electrical and electronic circuits covers a wide class of models and is associated with a large amount of computing. This book discusses the basics of the SPICE language, which is the basis of many modern circuit modeling systems. The consideration is carried out in relation to linear chains. The main methodological principle of the book is the introduction of SPICE language constructions as needed, dictated by the logical sequence of the presentation of chain theory. Thus, the gradual assimilation of new information is achieved with minimal distraction of attention from the content side of the subject.