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A course key is a 12 or 15-digit string of numbers and letters that identifies which course youre taking. Your instructor should provide this to you. Try locating your course key in your syllabus or on your instructors course web pages.
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ELECTRICITY FOR REFRIGERATION, HEATING, AND AIR CONDITIONING, 8E is the ideal book for students and beginning technicians. It provides readers with the basic electrical principles necessary to understand today's modern control systems. The practical approach taken in this book allows readers to focus exclusively on the electronics information they will use in the field, without bogging them down in unnecessary theory. ELECTRICITY FOR REFRIGERATION, HEATING, AND AIR CONDITIONING, 8E places an emphasis on developing systematic diagnosis and troubleshooting methods and procedures that will enable readers to become highly-skilled, professional HVAC-R service technicians. A comprehensive glossary is also included to assist those who are new to the field in understanding and using industry terms.