Transformer Basics

Chapter Transformer Basics

Complete Electronics Self Teaching Guide with Projects
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Complete Electronics Self Teaching Guide with Projects

  • CHAPTER 10 THE TRANSFORMER436You can also use transformers to increase voltage. For example, some of the equip-ment used to manufacture integrated circuits requires thousands of volts to operate. Transformers are used to increase the 240 volts supplied by the power company to the required voltage.When you complete this chapter, you will be able to do the following: ■ Recognize a transformer in a circuit. ■ Explain and correctly apply the concepts of turns ratio and impedance matching. ■ Recognize two types of transformer. ■ Do simple calculations involving transformers.TRANSFORMER BASICS1  Consider two coils placed close to each other, as shown in Figure 10.1. If you apply an AC voltage to the first (or primary) coil, the alternating current flowing through the coil cre-ates a fluctuating magnetic field that surrounds the coil. As the strength and polarity of this magnetic field changes, it induces an alternating current and a corresponding AC voltage in the second (or secondary) coil. The AC signal induced in the secondary coil is at the same fre-quency as the AC signal applied to the primary coil.Coil 1Coil 2FIGURE 10.1Both transformer coils are usually wound around a core made of a magnetic material such as iron or ferrite to increase the strength of the magnetic field.QUESTIONSA. When the two coils are wound around the same core, are they connected electri-cally? B. What type of device consists of two wire coils wound around an iron or ferrite core? Book Authorc10V106/12/2012 8:11 PM c10.indd 4366/14/2012 9:01:45 AM