Chapter 11 Alternating Current
Objectives • After completing this chapter, you will be able to: – Describe how an AC voltage is produced with an AC generator (alternator) – Define alternation , cycle , hertz , sine wave , period , and frequency – Identify the parts of an AC generator (alternator)
Objectives (cont’d.) – Define peak , peak-to-peak , effective , and rms – Explain the relationship between time and frequency – Identify and describe three basic nonsinusoidal waveforms – Describe how nonsinusoidal waveforms consist of the fundamental frequency and harmonics
Objectives (cont’d.) – Understand why AC is used in today’s society – Describe how an AC distribution system works
• There are two types of electricity used to perform work, such as lighting bulbs or running motors. • Direct current (DC), as its name implies, is a current that flows in one direction only. • Batteries develop this type of energy. • The second type of energy used today to perform useful work is alternating current (AC). • Unlike its converse, direct current, the direction of alternating current flow reverses with regularity. • Today, alternating current is the most used method to transmit electrical energy from one location to another.
Introduction • In late 1800, Edison used Direct Current. • His vision of electrified cities incorporated the idea of many small, DC-generating stations scattered about in the community, because there was no way to change or alter direct current to recoup transmission losses. • This limited the usefulness of DC to small, local areas and prohibited its usefulness in transmitting electrical energy over long distances. • Many small DC-generating stations.
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