Diodes in AC Circuits Produce Pulsating DC

Chapter Diodes in AC Circuits Produce Pulsating DC

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

  • CHAPTER 11 POWER SUPPLY CIRCUITS456When you complete this chapter, you will be able to do the following: ■ Describe the function of diodes in AC circuits. ■ Identify at least two ways to rectify an AC signal. ■ Draw the output waveforms from rectifier and smoothing circuits. ■ Calculate the output voltage from a power supply circuit. ■ Determine the appropriate component values for a power supply circuit.DIODES IN AC CIRCUITS PRODUCE PULSATING DC1  You can use diodes for several purposes in AC circuits, where their characteristic of conducting in only one direction is useful.QUESTIONSAssume that you apply 120 volts DC at point A of the circuit, as shown in Figure 11.1.A. What is the output voltage at point B? B. Suppose that you now apply 110 volts DC at point B. What is the voltage at point A? ABFIGURE 11.1ANSWERSA. 20 volts DC (Ignore, for now, the voltage drop of 0.7 volt across the diode.)B. 0 volts (The diode is reverse-biased.)Book Authorc11V107/04/2012 3:27 PM c11.indd 4567/4/2012 3:27:21 PM