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Siemens mercury unit

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Siemens mercury unit

The Siemens mercury unit is an obsolete unit of electrical resistance. It was defined by Werner von Siemens as the resistance of a mercury column with a length of one metre and uniform cross-section of 1mm2 held at a temperature of zero degrees Celsius. It is equivalent to approximately 0.953 ohm. In 1881 the siemens was formally defined by the metric system of units as the unit of electric conductivity, as the inverse of the ohm. However, the Siemens mercury unit was widely used in telegraph and telephone services until World War II.

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  • Units named after Siemens
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