Proposed Future Definition
Rather than a definition in terms of the force between two current-carrying wires, it has been proposed to define the ampere in terms of the rate of flow of elementary charges. Since a coulomb is approximately equal to 6.2415093×1018 elementary charges (such as electrons), one ampere is approximately equivalent to 6.2415093×1018 elementary charges moving past a boundary in one second, or the reciprocal of the value of the elementary charges in coulombs. The proposed change would define 1 A as being the current in the direction of flow of a particular number of elementary charges per second. In 2005, the International Committee for Weights and Measures (CIPM) agreed to study the proposed change. The new definition is expected to be formally proposed at the 25th General Conference on Weights and Measures (CGPM) in 2014.
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