Define one ampere.
(N/A) The current through a conductor is said to be $1$ ampere if a charge of $1$ coulomb flows through it in $1$ second. Mathematically,it is expressed as $I = Q/t$,where $I = 1 \text{ A}$,$Q = 1 \text{ C}$,and $t = 1 \text{ s}$.
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