Definition
Conventional electrical units are based on defined values of the Josephson constant and the von Klitzing constant, which allow practical measurements of electromotive force and electrical resistance respectively.
| Constant | Conventional (defined) value (CIPM, 1988) |
Empirical value (in SI units) (CODATA, 2010) |
|---|---|---|
| Josephson constant | KJ–90 = 483 597.9 GHz/V | KJ = 483 597.870(11) GHz/V |
| von Klitzing constant | RK–90 = 25 812.807 Ω | RK = 25 812.807 4434(84) Ω |
- The conventional volt, V90, is the electromotive force (or electric potential difference) measured against a Josephson effect standard using the defined value of the Josephson constant, KJ–90.
- The conventional ohm, Ω90, is the electrical resistance measured against a quantum Hall effect standard using the defined value of the von Klitzing constant, RK–90.
- Other conventional electrical units are defined by the normal physical relationships, as in the conversion table below.
Read more about this topic: Conventional Electrical Unit
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