The first edition of this highly successful textbook appeared in 1977. With the production of a fourth edition, the opportunity has been taken to change the title, from Basic Electrical Engineering, to indicate the usefulness of the book to both electrical and electronic engineers. Changes include a reorganisation of the early chapters to provide a fuller introduction to basic concepts, the inclusion of chapters on attenuators and filters, and oscillators, as well as the incorporation of more problems with all chapters.