This book starts at beginner level. The aim is to provide the reader complete understanding of foundations of electricity and radio electronics. These foundations are slowly built on and culminate at a solid advanced level. In this second edition some chapters have been expanded and whole new chapters added. The book is aimed at radio amateurs in any country as well as electrical and radio technicians. The book aims to provide clear understanding of radio and electrical concepts. The majority of the mathematics is typical of radio technician level. This book exceeds the standard prescribed by European Conference of Postal and Telecommunications (CEPT) TR61-01.