Jacobean resistance unit

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The Jacobean resistance unit was a unit of electrical resistance proposed by the German-Russian physicist Moritz Hermann von Jacobi in 1848 . Jacobi defined the resistance, which an arbitrarily chosen copper wire 7.6 m long and 0.67 mm diameter has wound on a serpentine cylinder, as a resistance unit.

He then sent copies of this cylinder to other well-known physicists of his time, but since these copies differed greatly, the unit was not particularly practical and was replaced by the so-called Siemens unit .

1 Jacobian resistance unit corresponded to approx. 0.64 Ohm .

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  • François Cardarelli: Scientific Unit Conversion. A Practical Guide to Metrication , Springer Verlag, London, 1999, p. 215.
  • H. Geiger & Karl Scheel (eds.): Handbuch der Physik Volume XVI , Springer Verlag, Berlin, 1927, p. 98.