Definition: A milliampere (symbol: mA) is a submultiple that the SI basic unit of electric current, the ampere. That is characterized as one thousandth of an ampere.

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History/origin: The milliampere has its origins in the ampere. The prefix "milli" suggests one thousandth the the basic unit that precedes, in this situation the ampere. The ampere can be preceded by any of the metric prefixes in order come report systems in the preferred magnitude.

Current use: together a submultiple of one SI unit, the milliampere is supplied worldwide, frequently for smaller dimensions of electric current. There are plenty of devices the measure devices in terms of milliamperes such together galvanometers and also ammeters, though these gadgets do not solely measure milliamperes.


Definition: The ampere (symbol: A), frequently referred to as simply amp, is the basic unit the electric present in the international System of units (SI). The ampere is characterized formally based on a resolved value for the primary school charge, e, that 1.602176634 × 10-19 when expressed in the unit C, i m sorry is same to A·s. The second is defined based on the cesium frequency, ΔνCs. This meaning is effective because 2019, and is a significant change indigenous the previous meaning of the ampere.

History/origin: The ampere is called after Andre-Marie Ampere, a French mathematician and physicist. In the centimeter-gram-second system of units, the ampere was defined as one tenth that the unit the electrical existing of the time, i beg your pardon is now known as the abampere. The dimension of the unit was liked such that it would certainly fit conveniently within the metre-kilogram-second mechanism of units. Before 2019, the ampere was defined formally together the constant current in ~ which a pressure of 2 × 10-7 newtons every meter length would be produced between two conductors, wherein the conductors room parallel, have infinite length, are inserted in a vacuum, and also have negligible circular cross-sections. In regards to the SI unit the charge, the coulomb, one ampere is defined as one coulomb of charge passing with a given point in one second. This an interpretation was daunting to realize v high precision, and as such was changed to be more intuitive, and easier come realize. Previously, because the definition included a recommendation to force, the SI kg, meter, and 2nd needed to be defined before the ampere might be defined. Now, that is just dependent on the an interpretation of the second. One potential limit of the redefinition is the vacuum permeability, vacuum permittivity, and also impedance of complimentary space were exact prior to the redefinition, yet will currently be topic to experimental error.

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Current use: together the SI base unit of electrical current, the ampere is used an international for almost all applications involving electrical current. One ampere can be express in the form of watts/volts, or W/V, such that an ampere equals 1 W/V, since power is defined as a product of current and voltage.

Milliampere to Ampere switch Table

Milliampere Ampere
0.01 mA1.0E-5 A
0.1 mA0.0001 A
1 mA0.001 A
2 mA0.002 A
3 mA0.003 A
5 mA0.005 A
10 mA0.01 A
20 mA0.02 A
50 mA0.05 A
100 mA0.1 A
1000 mA1 A

How to transform Milliampere come Ampere

1 mA = 0.001 A1 A = 1000 mA