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siemens sie·mens (sē'mənz)
n. pl. siemens
A unit of electrical conductance in the International System of Units, equal to one ampere per volt.
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).