# Microamp vs. Ampere: What's the Difference?

## Microamp and Ampere Definitions

#### Microamp

One millionth (10-6) of an ampere, abbreviated as µA.

#### Ampere

The basic unit of electric current, equal to one coulomb per second and equivalent to the current, flowing in two straight parallel wires of negligible cross section separated by a distance of one meter, that produces a force between the wires of 2.0 × 10-7 newtons per meter of length. The value of an ampere in the International System differs very slightly from that in the meter-kilogram-second-ampere system of units. See Table at measurement.

#### Ampere

A unit of electrical current, the standard base unit in the International System of Units; colloquially amp. Abbreviation: amp, Symbol: A
Definition: The ampere, symbol A, is the SI unit of electric current. It is defined by taking the fixed numerical value of the elementary charge e to be 1.602
X 10−19 when expressed in the unit C, which is equal to A
S, where the second is defined in terms of ΔνCs. ([https://www.bipm.org/en/si-base-units/ampere The International Bureau of Weights and Measures])

#### Ampere

The unit of electric current; - defined by the International Electrical Congress in 1893 and by U. S. Statute as, one tenth of the unit of current of the C. G. S. system of electro-magnetic units, or the practical equivalent of the unvarying current which, when passed through a standard solution of nitrate of silver in water, deposits silver at the rate of 0.001118 grams per second. Called also the international ampère.

#### Ampere

A former unit of electric current (slightly smaller than the SI ampere)