The ampere ($\text{A}$) is the standard SI unit used to measure electric current. Electric current is defined as the rate of flow of electric charge, typically measured in coulombs per second. This unit quantifies the magnitude of an electrical flow through a given cross-sectional area, indicating how many units of electric charge pass a point per unit of time. It is a fundamental physical quantity in electromagnetism and is essential for describing the behavior and power characteristics of electrical circuits and devices.