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Electrical Theory & Applications for HVACR
©2012 ESCO Group
Student Worksheet
Page 13
Chapter 1: What Is Electricity?
Name _______________________________
Date _____________________
Use an ohmmeter to measure the resistance of an incandescent light bulb (hot and cold), a
heaƟng element, relay coil and contacts (NO and NC), and fan motor. Record measurements.
NOTE: Disconnect and remove all items to be tested from any live circuit.
Never use an Ohmmeter with voltage.
1.
Incandescent lamp, cold: __________________________
2.
Incandescent lamp, hot: __________________________
3.
HeaƟng element: __________________________
4.
Relay coil: __________________________
5.
Contacts: __________________________
6.
Fan Motor: __________________________