Conventional electrical unit
Definition

Conventional electrical unit

Section Title: Definition
Table Section Text: None

Constant	Conventional exact value (CIPM, 1988; until 2018)	Empirical value (in SI units) (CODATA, 2014)	Exact value (SI units, 2019)

Josephson constant	KJ-90 = 483597.9 GHz/V	KJ = 483597.8525(30) GHz/V	KJ = 2 × 1.602176634×10−19 C/6.62607015×10−34 J⋅s

von Klitzing constant	RK-90 = 25812.807 Ω	RK = 25812.8074555(59) Ω	RK = 6.62607015×10−34 J⋅s/(1.602176634×10−19 C)2

Sentence(s)

In 1988, the CIPM conventional values for the Josephson constant as exactly KJ-90 = 483597.9×10⁹ Hz/V and for the von Klitzing constant as exactly RK-90 = 25812.807 Ω.

final_sentence: In 1988, the CIPM conventional values for the Josephson constant as exactly KJ-90 = 483597.9×10⁹ Hz/V and for the von Klitzing constant as exactly RK-90 = 25812.807 Ω.