why is economical to use ac rather than DC to transfer power
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AC is much easier (therefore cheaper) to step up and down in voltage than DC, and can be done more efficiently (typcially, currently) than the much more expensive and complex DC step-up/step-down systems. ... Over the distances that mains power is transmitted, there are some losses when using AC, but the losses are small.
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upside 1 crrctt .............
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