how many electrons pass per second through the cross section area per second to constitute 1 ampere current
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1 Ampere current is by definition 1 Coulomb charge through a cross section of conductor at a given point in one second. So you refer to number of electrons which together hold a charge of 1 Coulomb. This number is 6.24 × 10^18 electrons, which will cross through a section of conductor in one second.
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