Book excerpt: Written by the author of the hugely successful The Physics Companion, The Electronics Companion covers the core topics of electrical engineering, providing a logical and consistent account of the way in which basic electronic circuits are designed and how they work. The author illustrates key concepts and principles of electronic devices in clear, one-page, figure-rich descriptions. Intended as a support to more conventional electronics texts, the book contains many worked examples and review questions throughout. It concludes with a laboratory section describing experiments that can be carried out by students in their own time or under the supervision of an instructor. Discussing the principal issues of electrical and electronic engineering and applied physics, this book will be an invaluable resource to students revising for exams and throughout the course of their degree.