Why is AC used more often than DC? And why are power lines usually at high voltages? Here I explain the history of alternating and direct current and work an example showing how high voltage transmission is more efficient in terms of line losses. Then I relate this to the use of AC for electricity distribution.
Full edX course with interspersed practice problems to help you learn:
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Aaron Danner is a professor in the Department of Electrical and Computer Engineering at the National University of Singapore.
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Video filmed and edited by Cheryl Lim.
@randomcheryl
