Electrical Units, Fundamental Constants, and the 1983 Least Squares Adjustment

This review touches upon four topics: (1) The International System or SI electrical units, specifically, the volt (V), ohm (Ω), ampere (A), and the so-called laboratory or as-maintained units for the same quantities; (2) the relationships between these laboratory units, experiments to realize their SI definitions, and the fundamental constants of nature; (3) the 1983 least squares adjustment of the constants; and (4) future electrical measurements research which can improve our knowledge of the constants.