/see"meuhnz/; Ger. /zee"meuhns/, n.1. (Ernst) Werner von /erddnst" verdd"neuhrdd feuhn/, 1816-92, German inventor and electrical engineer.2. his brother, Sir William (Karl Wilhelm Siemens), 1823-83, English inventor, born in Germany.
* * *(as used in expressions)Siemens Martin processSiemens Sir Charles WilliamKarl Wilhelm Siemens
* * *▪ unit of energy measurementunit of electrical conductance. In the case of direct current (DC), the conductance in siemens is the reciprocal of the resistance in ohms (ohm) (S = amperes (ampere) per volts (volt)); in the case of alternating current (AC), it is the reciprocal of the impedance (electrical impedance) in ohms. A former term for the reciprocal of the ohm is the mho (ohm spelled backward). It is disputed whether the siemens was named after the German-born engineer-inventor Sir William Siemens (Siemens, Sir William) (1823–83) or his brother, the electrical engineer Werner von Siemens (Siemens, Werner von) (1816–92).
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