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You should revise your question as it is a very broad stroke of a question that is difficult to answer without being a little more specific. Are you asking why home outlets use AC while appliances use DC? Are you asking why Transformers step up AC voltage instead of DC voltage? Vaguely it's due to cost effectiveness, AC travels more readily across cables that have less copper wire and more insulation rather than the opposite for DC voltage/current. I need a more targeted question. Hope this helps.

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12y ago

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