Capacitors in AC Circuits

Chapter Capacitors in AC Circuits

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

  • CHAPTER 6 FILTERS212When you complete this chapter, you will be able to do the following: ■ Calculate the output voltage of an AC signal after it passes through a high-pass RC filter circuit. ■ Calculate the output voltage of an AC signal after it passes through a low-pass RC circuit. ■ Calculate the output voltage of an AC signal after it passes through a high-pass RL circuit. ■ Calculate the output voltage of an AC signal after it passes through a low-pass RL circuit. ■ Draw the output waveform of an AC or combined AC-DC signal after it passes through a filter circuit. ■ Calculate simple phase angles and phase differences.CAPACITORS IN AC CIRCUITS1  An AC signal is continually changing, whether it is a pure sine wave or a complex sig-nal made up of many sine waves. If such a signal is applied to one plate of a capacitor, it will be induced on the other plate. To express this another way, a capacitor will “pass” an AC signal, as illustrated in Figure 6.1.VinVoutCFIGURE 6.1NOTE Unlike an AC signal, a DC signal is blocked by a capacitor. Equally important is that a capacitor is not a short circuit to an AC signal.QUESTIONSA. What is the main difference in the effect of a capacitor upon an AC signal versus a DC signal? Book Authorc06V107/04/2012 3:08 PM c06.indd 2127/4/2012 3:08:44 PM