The ampere is described as one coulomb per:

1. The unit follows directly from the definition of current. 2. Current is the rate at which charge flows. 3. Charge is measured in coulombs and rate is per unit time. 4. So an ampere is one coulomb per second. _Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 20 'Electric Current, Resistance, and Ohm's Law', sections 20.1-20.7_