Master the basic electrical principles necessary to understand today's modern control systems with ELECTRICITY FOR REFRIGERATION, HEATING, AND AIR CONDITIONING, 9th edition. With its meticulous accuracy and easy-to-understand presentation, the book takes a practical approach that allows you to focus exclusively on the electronics information you will use in the field, without bogging you down in unnecessary theory. This edition continues to emphasize systematic diagnosis and troubleshooting methods and procedures that will help you become a highly-skilled, professional HVAC-R service technician.