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siemens
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siemens

unit of energy measurement
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Also known as: mho, reciprocal ohm
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siemens (S), unit of electrical conductance. In the case of direct current (DC), the conductance in siemens is the reciprocal of the resistance in ohms (S = amperes per volts); in the case of alternating current (AC), it is the reciprocal of the 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 (1823–83) or his brother, the electrical engineer Werner von Siemens (1816–92).