Quick & Basic Electricity : A Contractor's Easy Guide to HVAC Circuits, Controls, and Wiring Diagrams (Practical Is Good (P.I.G.) Technical Training Series)

This book gives a very simple explanation of how a basic electrical circuit is made up of a power supply, a switch, and a load. It also explains how to troubleshoot a circuit, and how to use a meter. This book is especially for the HVAC contractor. It concentrates on low voltage circuits for heating and air conditioning controls.