Electric current:
The controlled movement or drift of electrons through a substance is called the electric current.
Current may also be defined as the rate of net motion of an electric charge across a cross sectional boundary(as shown in fig). A random motion of electrons in a metal doesn't constitute a unless there is a net transfer of charge with timew i.e. electric current, i= Rate of transfer of electric charge
= dQ/dt
Coulomb is the practical as well as SI unit for measurement of electric charge charge. One coulomb is approximately equal to 624 x 10^16 electrons.
Since current is the rate of flow of electron through the conductor and coulomb is the unit of electric charge, the current may be specified in coulombs per second. In practice the term coulomb per second is seldom used, a shorter term, ampere is used instead.
See the Below video tutorial for More details:
Video -2
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