The purpose of the book is familiarization of students with the types of electrical systems that are in general use in light aircraft.

Included throughout are wiring schematics and excerpts from wiring schematics. These are from various makes and models of aircraft and are for the purpose of illustration.

The text is prepared for the aircraft maintenance technician and it is assumed that the user has a basic understanding of electrical fundamentals such as electrical units, ohms law, use of measuring instruments, magnetism, electromagnetism, and electromagnetic induction