Introduction to AC Pre-Test and Review

Chapter CHAPTER 5 AC Pre-Test and Review

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

  • 5AC Pre-Test and ReviewYou need to have some basic knowledge of alternating current (AC) to study electronics. To understand AC, you must understand sine waves.A sine wave is simply a shape, like waves in the ocean. Sine waves in electronics are used to represent voltage or current moving up and down in magnitude. In AC electron-ics, some signals or power sources (such as the house current provided at a wall plug) are represented by sine waves. The sine wave shows how the voltage moves from 0 volts to its peak voltage and back down through 0, its negative peak voltage, at 60 cycles per second, or 60 Hertz (Hz).The sound from a musical instrument also consists of sine waves. When you combine sounds (such as all the instruments in an orchestra), you get complex combinations of many sine waves at various frequencies.The study of AC starts with the properties of simple sine waves and continues with an examination of how electronic circuits can generate or change sine waves.Book Authorc05V107/04/2012 3:03 PM c05.indd 1877/4/2012 3:03:51 PM