In the International System of Units, the ampere is the base unit of electric current.
The ampere is named after André-Marie Ampère, a French mathematician and physicist whose work helped establish the science of electromagnetism. Its symbol is A. Since 2019, the SI defines the ampere by fixing the numerical value of the elementary charge.
Electric current describes the rate at which electric charge flows. One ampere corresponds to a flow of one coulomb of charge per second, although the ampere itself is the SI base unit and the coulomb is a derived unit.
The volt measures electric potential difference, while the ohm measures electrical resistance. These terms are related by Ohm’s law, V = IR. The ampere should therefore not be confused with either voltage or resistance.