Current is defined as the rate of flow of charge through any cross section of a conductor. Electric current is defined as the net charge passing through any cross section per unit time.
Suppose the net charge 'q' passes through any cross section of the conductor in time 't', then the current 'i' is given by
i=q/t
Where 'q' is in coloumbs and 't' is in seconds and then 'i' is in coloumb/sec or ampere. Like the mass, current is macroscopic quantity in SI system and is dimensionally denoted as I or A
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