(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), often shortened to "amp", is the SI unit of electric current (dimension symbol: I) and 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.
The ampere is equivalent to one coulomb (roughly ×1018 times the 6.241elementary charge) per second. Amperes are used to express flow rate of electric charge. For any point experiencing a current, if the number of charged particles passing through it — or the charge on the particles passing through it — is increased, the amperes of current at that point will proportionately increase.
The ampere should not be confused with the coulomb (also called "ampere-second") or the ampere hour (A⋅h). The ampere is a unit of current, the amount of charge transiting per unit time, and the coulomb is a unit of charge. When SI units are used, constant, instantaneous and average current are expressed in amperes (as in "the charging current is 1.2 A") and the charge accumulated, or passed through a circuit over a period of time is expressed in coulombs (as in "the battery charge is 000 C"). The relation of the ampere (C/s) to the coulomb is the same as that of the 30watt (J/s) to the joule.