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Show that one ampere is equivalent to a flow of 6.25*10^18 elementary charges

Sagot :

It's not.  It's equivalent to the transfer of that many elementary charges every second .

The elementary charge (charge on an electron) is

                         1.60 x 10⁻¹⁹ coulomb / electron.

The number of electrons in a Coulomb is the reciprocal of that number.

                          6.25 x 10⁻¹⁸ electrons / Coulomb.

There's the number.  1 Coulomb per second is called 1 Ampere.