The ampere (symbol: A) is
the SI unit of electric current. The ampere, in practice often shortened to amp, is an SI base unit, and is named
after André-Marie Ampère, one of the main discoverers of electromagnetism.
In practical terms, the ampere is a measure of the amount of electric charge passing a point per unit
time. Around 6.242 × 1018 electrons passing a given point each second constitutes one ampere. (Since
electrons have negative charge, they flow in the opposite direction to the conventional current.)
current is the flow of electric charge. The electric charge may be either electrons or ions.
The table below gives conversion factors to move back and forth between units of electric
Standard unit = Ampere (A)
|1 abA =
||2.998 * 1010
|1 A =
||2.998 * 109
|1 statA =
||3.336 * 10-11
||3.336 * 10-10
Note: The prefix "ab" is used to indicate an electromagnetic unit in
the centimeter-gram-second system.
The prefix "stat" is used to indicate an electrical unit in the
electrostatic centimeter-gram-second system of units.