Chapter Objectives (See related pages) After studying this chapter, you should be able to: • Describe what a thyristor is and list its main applications. • Explain the basic operating mode of a thyristor. • Describe the construction and operation of a diac. • Describe the construction and operation of an SCR. • Explain what is meant by the forward breakover voltage of a diac, SCR, or triac. • Define the term holding current, IH, as it relates to thyristors. • List and explain important SCR ratings. • Explain how an RC phase-shifting network can control the load current in an SCR circuit. • Explain the differences and similarities between an SCR and a triac. • Explain the different operating modes of a triac. • Explain the construction, operation, and applications of a UJT.
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