7 Electrical Issues
7.1 FUNDAMENTALS
Electricity and magnetism are concerned with charges and their movements. The fundamental ideas of electricity and magnetism are discussed in introductory physics texts. The following terms are given as a background about generators and controls.
Current: The current is the flow of charge q (electrons in most cases) past some point. Charge is measured in coulombs. Direct current (DC) results from flow in one direction, and alternating current (AC) results when the flow changes direction. The frequency (number of cycles per second) is measured in hertz (Hz).
For electric utilities in the United States, the voltage and current change 60 times per second (60 Hz). Other countries ...
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