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Alternating current or AC is the rapid change from positive to negative electricity of 60 or more times each second. The root of this rapid change is inside of the generator. Within the generator is a spinning coil of wire. This coil does two half revolutions to make a complete turn. During the first half spin, the generator generates a positive flow of electrons. For the second half turn, negative electrons flow. This rapid alternation from positive to negative flow creates alternating current. Although it may at first seem useless to have a current that changes so quickly, it is useful for things such as light bulbs, because it does not matter which way the electricity is flowing. For equipment that requires a steady flow of electricity, DC current is used.
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David Macaulay "Electric Circuit"
Houghton Mifflin Company, Boston, 1988
David Macaulay
Houghton Mifflin Company, Boston, 1988
Bibliography
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 | This diagram shows the voltage... more
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