Electricity: Relays, Contactors and Starters (Module 7)
A relay is an electrical switch. It opens and closes under the control of a separate electrical circuit. This topic will explain the workings of a relay.
This course is intended to provide students and practicing technicians with safety information and knowledge related to personal protective equipment. This course is not intended as a sole source of training for HVACR technicians.
CEH 3 CEU 0.3
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Electricity: Transformers (Module 6)
CourseYou will be able to explain the purpose of a transformer, describe the components of a transformer, list the common defects you may encounter when working with transformers, and explain how the power-handling capacity of a transformer is measured.
$55
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Electricity: Fundamentals of Alternating Current (Module 8)
CourseIn this lesson we will study the nature and composition of alternating current. You will be able to explain alternating current and explain sine waves.
$55
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Electricity Alternating Current: Reactance, Impedance, & Power Factor (Module 9)
CourseDifferent components of a circuit create opposition to alternating current in different ways. In this topic, you will learn to calculate the resistance offered by capacitors and inductors.
$55