(EN) The International System of Units (SI) (PDF), su bipm.org, BIPM, 9 dicembre 2019, p. 160 (Appendix 1. Decisions of the CGPM and the CIPM). URL consultato il 10 settembre 2023.
«The ohm is the electric resistance between two points of a conductor when a constant potential difference of 1 volt, applied to these points, produces in the conductor a current of 1 ampere, the conductor not being the seat of any electromotive force.»
