Science  People  Locations  Timeline
Index: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Home > Siemens (unit)


The siemens (symbol: S) is an SI derived unit of measurement for electric conductance, being the inverse of the ohm (Ω), named after Werner von Siemens.

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 (the upside-down letter Ω). The term siemens is used universally in science and primarily in electrical applications, while mho is used primarily in electronic applications.

SI electricity units

SI electricity units

[ }|action=edit}} Edit }]

SI Base unit
Name Symbol Quantity Notes
ampere A Current
SI Derived units
Name Symbol Quantity Notes
volt V Potential difference
ohm Ω Resistance, Impedance, Reactance
farad F Capacitance
henry H Inductance
siemens S Conductance, Admittance, Susceptance −1
coulomb C Electric charge
ohm · metre Ω · m Resistivity
siemens per metre S / m Conductivity
henry per metre H /m Permeability μ
farad per metre F / m Permittivity ε
reciprocal farad F−1 Elastance =F−1

SI derived units Units of electrical conductance

Read more »

Non User