Ampere
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The ampere is the measure of electrical current. It is also commonly referred to as an amp. The standard abbreviation for the Ampere is A.


SI multiples

The unit Ampere may be modified by SI standard prefixes.

Many consumer products are rated in milliamps or 1/1000th of an amp, also written as mA, i.e. 20mA.


SI multiples for Amp (A)
Submultiples Multiples
Value Symbol Name Value Symbol Name
10−1 A dA deciAmp 101 A daA decaAmp
10−2 A cA centiAmp 102 A hA hectoAmp
10−3 A mA milliAmp 103 A kA kiloAmp
10−6 A µA microAmp 106 A MA megaAmp
10−9 A nA nanoAmp 109 A GA gigaAmp
10−12 A pA picoAmp 1012 A TA teraAmp
10−15 A fA femtoAmp 1015 A PA petaAmp
10−18 A aA attoAmp 1018 A EA exaAmp
10−21 A zA zeptoAmp 1021 A ZA zettaAmp
10−24 A yA yoctoAmp 1024 A YA yottaAmp
Common prefixed units are in bold face.

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