Question

what is difference between alternate current and direct current

Answer 1

AC vs. DC (Alternating Current vs. Direct Current) Electricity flows in two ways: either in an alternating current (AC) or in a direct current (DC). ... The difference between AC and DC lies in the direction in which the electrons flow. In DC, the electrons flow steadily in a single direction, or "forward."
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Answer 2

AC :- 1) it changes it's polarity after each second 2) it shows skin effect  3) full form-alternating current  DC:- 1)it doesn't changes it's polarity after each second  2)it does not shows skin effect 3) full form-direct current