Siemens (unit)

The siemens (symbol: S) is the SI unit of electric conductance.

Explanation

Mho is a now eccentric name for this unit of electrical conductance, equal to 1 Ω−1. It is derived by spelling ohm backwards. Its symbol is a greek letter omega turned upside down mho ℧ ({{uplusfirst}}2127). The term siemens is used universally in science and primarily in electrical applications, while mho is used primarily in electronic applications. The upside down ohm symbol has the advantage of being less likely to be confused with a variable than the letter S when doing algebric calculations by hand where fine typographical distinctions (such as italic for variables and roman for unit names) are hard to maintain.

Related Topics:
Electrical conductance - Ohm

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Siemens are related to other units as follows

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mathrm{S} = mho = racmathrm{A}mathrm{V} = rac1Omega

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• S = siemens
• ? = mho
• A = amperes
• V = volts

The formula for computing conductance is as follows:

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G = rac1R = rac{I}V

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• G = Conductance (in siemens)
• R = Resistance (in ohms)
• I = Current (in amperes)
• V = Voltage (in volts)

Example: G = 1 / 6 Ω = 0.1667 S

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