(A); Andre M. Ampere, 1775-1836; satuan pokok SI bagi kuat arus listrik, didefinisikan sebagai arus konstan yang jika dipertahankan dalam dua konduktor tunggal sejajar dengan panjang tak terhingga dan luas penampangnya dapat diabaikan) yang dipisahkan oleh jarak satu meter dalam suatu ruangan hampa, menghasilkan sebuah gaya antarkawat 2 X 10-7 newton per meter panjang; ekuivalen dengan satu coulomb per detik_ Dulu, disingkat amp.
Demonstration model of a moving iron ammeter. As the current through the coil increases, the plunger is drawn further into the coil and the pointer deflects to the right.
|Unit system||SI base unit|
|Unit of||Electric current|
|Named after||André-Marie Ampère|
The ampere (SI unit symbol: A, dimension symbol: I), often shortened to "amp", is a unit of electric current. In the International System of Units (SI) the ampere is one of the sevenSI base units. It is named after André-Marie Ampère (1775–1836), French mathematician and physicist, considered the father of electrodynamics.
SI defines the ampere in terms of other base units by measuring the electromagnetic force between electrical conductors carrying electric current. The earlier CGS measurement system had two different definitions of current, one essentially the same as the SI's and the other using electric charge as the base unit, with the unit of charge defined by measuring the force between two charged metal plates. The ampere was then defined as one coulomb of charge per second. In SI, the unit of charge, the coulomb, is defined as the charge carried by one ampere during one second.
In the future, the SI definition may shift back to charge as the base unit, with the coulomb defined in terms of the elementary charge on electrons and protons (one coulomb equals the charge of roughly ×1018 protons). 6.242