An electric circuit must have...?

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HVAC technicians install, maintain, and repair heating, ventilation, and air conditioning systems, focusing on temperature control, air quality, and energy efficiency. Important components include furnaces, air conditioners, heat pumps, air handlers, and ductwork. Technicians must master electrical troubleshooting, refrigerant handling, and airflow diagnostics.  Core HVAC Technician Fundamentals HVAC System Types: Common systems include split systems (indoor furnace + outdoor A/C) and ductless mini-splits. Key Components: Furnace: Heats air, usually with gas or electricity. Condenser/AC... Show more

1. An electric circuit must have...?