The most commonly used unit of electrical current is the ampere, often referred to as "amp." It is a fundamental unit in the International System of Units (SI) and represents the flow of electric charge. Specifically, one ampere is defined as the flow of one coulomb of charge per second. The ampere is essential for understanding electricity and electrical circuits, as it quantifies how many electrons are flowing through a conductor. Amperes are frequently used in practical applications, such as measuring the current in household circuits and electrical devices, establishing power requirements and ensuring safety.