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HVAC
NATE Core & Service Certification
Electrical Fundamentals for HVAC
Knowledge Check
Electrical Fundamentals for HVAC
Knowledge Check
Knowledge Check
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What is the typical secondary voltage output of a residential HVAC step-down transformer, and what is it primarily used to power?
A
48V secondary used for ECM motor control boards
B
5V DC secondary used for digital thermostat displays
C
24V secondary used to power thermostats, control relays, gas valves, and contactors
D
120V secondary used to power the contactor coil directly
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