Electrical Components - Pearson

564 Electrical Components UNIT 36 OBJECTIVES After completing this unit, you will be able to: 1. determine the resistance value of a color-banded fixed resistor. 2. provide examples of where and how transformers are used. 3. identify paper and film, electrolytic, ceramic, and mica capacitors. 4. identify the different types of thermostats. 5. explain cut-in, cut-out, and differential on pressure switches. 6. test transformers, capacitors, contactors, and relays. 7. list the different types of fuses and overloads. 8. explain the difference between relay logic and solid-state logic. 9. describe how a silicon rectifier operates. INTRODUCTION Most HVACR service work deals with Electrical problems. These problems can be caused by component failure, im-proper installation, or misuse. It is therefore important that HVACR technicians have a thorough and complete under-standing of Electrical Components and wiring diagrams.

Resistors are found in many circuits ( Figure 36-1 ). They are designed to allow for a measured resistance that can affect either voltage or current as calculated by using Ohm’s law. As an example, a resistor could be used in an electrical test meter to limit the current flow. Fixed resistors can be

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