Electricity what does ma mean

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What Does Milliamp mA Mean? A milliamp may also be known as a milliampere. Corrosionpedia Explains Milliamp mA An ampere is the SI unit for measuring an electric current, and is equal to the amount of current, which when allowed to pass through two parallel infinite length conductors separated by a distance of one meter from each other in a vacuum with a very minimal cross sectional area, would generate an electric force of 2 x 10 -7 Newtons per meter.

Current measurements may be measured in either amperes or milliamperes. Synonyms Milliampere. Share this Term. The prefix "milli" indicates one thousandth of the base unit it precedes, in this case the ampere. The ampere can be preceded by any of the metric prefixes in order to report units in the desired magnitude. As a submultiple of an SI unit, the milliampere is used worldwide, often for smaller measurements of electrical current.

There are many devices that measure units in terms of milliamperes such as galvanometers and ammeters, though these devices do not exclusively measure milliamperes.

The ampere symbol: A , often referred to as simply amp, is the base unit of electric current in the International System of Units SI. In terms of the SI unit of charge, the coulomb, one ampere is defined as one coulomb of charge passing through a given point in one second. The ampere is named after Andre-Marie Ampere, a French mathematician and physicist.

In the centimeter-gram-second system of units, the ampere was defined as one tenth of the unit of electrical current of the time, which is now known as the abampere.

The size of the unit was chosen such that it would fit conveniently within the metre-kilogram-second system of units. The current definition of the ampere has been in place since but may change in the near future. As the SI base unit of electric current, the ampere is used worldwide for almost all applications involving electric current.

The definition of some SI base units may change in the near future.