Current, a fundamental electrical quantity, is measured in amperes (A). It represents the flow of electric charge, quantifying the amount of charge passing through a point in a circuit per unit time. Devices used to measure current include ammeters, multimeters, and current clamp meters. These instruments indicate current levels in various units, including milliamperes (mA) and microamperes (µA), depending on the application and the magnitude of the current being measured.