Just to check, are you asking why we use AC instead of DC for power transmission?
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From: Phys-l <phys-l-bounces@mail.phys-l.org> On Behalf Of Bill Norwood via Phys-l
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Subject: [Phys-L] youtube the.tragic story of nikola Tesla
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In this story of Tesla's life it is mentioned that a crucial reason for going with ac for the bulk of electric power transmission is the ability to deliver (I think) twice as much power with pre-existing electric lines.