Electric current is a physical quantity that equals the electric charge passing through a cross-section of a conductor per unit of time:
$$I=\frac{q}{\Delta t}$$
where,
q— charge passing through the conductor;
Δt— time interval.
Unit of current intensity in the SI system is the ampere (A). The current in a wire is 1A if, in one second, the wire carries a charge equal to one coulomb (1C). The definition of a coulomb is based on the fixed value of the elementary charge, 1.602 176 634 · 10–19 A · s.
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