This textbook of worked problems provides coverage of selected material from the Business and Technician Education Council's Bank of objectives in Electrical and Electronic Principles at NIII level. However it can also be regarded as a basic textbook for a much wider range of courses. It provides a follow-up to the "Electrical and Electronic Principles 2 Checkbook". The aim of the book is to introduce students to the basic electrical principles needed by technicians in fields such as electrical engineering, electronics and telecommunications areas. This second edition incorporates new material on Norton's theorem, modulation, filter and attenuation circuits, in addition to a number of other amendments.