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Electricity or 'current' is nothing more than moving electrons along a conductor, like a wire, that have been harnessed for energy. Therefore, the difference between AC and DC has to do with the direction in which the electrons flow. In DC, the electrons flow steadily in a single direction, or "forward. " In AC, electrons keep switching directions, sometimes going "forward" and then going "backward. " Alternating and Direct current. Origins of AC and DC current A magnetic field near a wire causes electrons to flow in a single direction along the wire, because they are repelled by the negative side of a magnet and attracted toward the positive side. AC generators gradually replaced Edison's DC battery system because AC is safer to transfer over the longer city distances and can provide more power. Video comparing Alternating and Direct Current Use of transformers with Alternating Current (AC) Photo editor online - Pixlr.com edit image.
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