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milliampere

Definition: A milliampere (symbol: mA) is a submultiple of the SI base unit of electrical current, the ampere. It is defined as one thousandth of an ampere.

History/origin: The milliampere has its origins in the ampere. 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.

Current use: 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.