The rate at which current flows is measured in.

If you're talking water current, it could be gallons per hour, liters per second, acre feet per month, feet per second, mile per hour, etc. Any time rate of volume or distance.

If you're talking electrical current, then the unit is almost certainly 'Amperes'.

Ampere

Explanation:

The ampere is the unit of measurement in the international system. Its equal to a coulomb/second. It can be describe as the rate of charges flowing throught a conductor