Ampere: Unit of electric current. [ EDU Science ]

 Ampere: Unit of electric current.

The ampere often shortened as to "amp", is the unit of electric current in the International System of Units (SI). It is named after André-Marie Ampère (1775–1836), a French mathematician and physicist.

In practical terms, the ampere is a measure of the amount of electric charge passing a point in an electric circuit per unit time with 6.241 × 1018 electrons, or one coulomb per second constituting one ampere

History

The ampere is named for French physicist and mathematician André-Marie Ampère (1775–1836), who studied electromagnetism and laid the foundation of electrodynamics. In recognition of Ampère's

contributions to the creation of modern electrical science, an international convention, signed at the 1881 International Exposition of Electricity, established the ampere as a standard unit of electrical measurement for electric current.

Ammeter

An ammeter (from an ampere meter) is a measuring instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. The ammeter is usually connected in series with the circuit in which the current is to be measured. An ammeter usually has low resistance so that it does not cause a significant voltage drop in the circuit being measured.

Instruments used to measure smaller currents, in the milliampere or microampere range, are designated as milliammeters or microammeters. Early ammeters were laboratory instruments that relied on the Earth's magnetic field for operation. By the late 19th century, improved instruments were designed which could be mounted in any position and allowed accurate measurements in electric power systems. It is generally represented by the letter 'A' in a circuit.

Conclusion

So we can conclude that  Ampere is the base unit for measuring the flow of electrons in a circuit. Ampere is named after André-Marie Ampère, it is measured using a device known as Ammeter.