The main reason that led the Authors to write the further Electrical Circuit book is mainly due to request of their students to have an ordered collection of the lesson arguments. The topics covered by the book are those generally carried out in the first or second year of bachelor, without referring specifically to a specific engineering course. The Authors have tried to deal with the various topics in a simple way, sometimes by limiting the generality of the demonstrations, in order to increase the skills of the student in the application of the electrical circuit theory. At the same time the Authors have not limited the complexity of the matter but have tried to present in a fairly complete way the various components, the various behaviours and methods of solution. Finally, at the end of the main chapters there are some numerical examples fully solved so that it can be tested by the student the knowledge of the theoretical concepts.