The unit of measurement for the strength of electric current is the ampere, often abbreviated as A. It quantifies the flow of electric charge through a conductor and is one of the seven base units in the International System of Units (SI). One ampere is defined as the constant current that, if maintained in two straight parallel conductors of infinite length and negligible circular cross-section, would produce a force of 2 × 10⁻⁷ newton per meter of length between them in a vacuum.