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Proposed Changes to the SI and Their Impact on Electrical Metrology

Abstract: Recent proposals to fundamentally change the SI system of units have generated considerable debate and are now being seriously considered by international committees. These proposals all have a common theme: to exactly fix the values of a set of fundamental physical constants and then to define the SI units with respect to the values of these invariants. The proposed changes and the ways in which national standards institutes would typically realize the SI units are outlined. The expected benefits and drawbacks of these changes are reviewed as they pertain to measurement science, to fundamental constants and in particular to electrical metrology. The positions of the Consultative Committee for Units, the Consultative Committee for Electricity and Magnetism and the Committee on Data for Science and Technology (CODATA) Task Group for Fundamental Constants are summarized, as well as outline possible schedules and the process that must be followed to implement such a change in the SI.