Alternating Current Switchboard, 19th Century
Alternating current (AC), is an electric current in which the flow of electric charge periodically reverses direction, whereas in direct current (DC), the flow of electric charge is only in one direction. The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage. The War of Currents was a series of events surrounding the introduction of competing electric power transmission systems in the late 1880s and early 1890s, with the main players being the direct current (DC) based Edison Electric Light Company and the alternating current (AC) based Westinghouse Electric Company. The lower cost of AC power distribution prevailed, though DC systems persisted in some urban areas throughout the 20th century. DC power is used widely in all modern electronic devices such as computers, telephones, and automotive systems.
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Photo credit: © Photo Researchers / Alamy / Afripics
License: Licensed
Model Released: No
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