Ohm

Ohm is a unit of electrical resistance in the International System of Units (SI). It is named after German physicist Georg Simon Ohm, who first formulated Ohm's Law.

Definition

The ohm is defined as an electrical resistance between two points of a conductor when a constant potential difference of one volt, applied to these points, produces in the conductor a current of one ampere, the conductor not being the seat of any electromotive force.

History

The ohm was officially adopted as an SI unit in 1881 before the establishment of the SI. The term 'ohm' was coined by William Thomson, 1st Baron Kelvin.

Symbol

The symbol for the ohm is the Greek letter Omega (Ω). If the Greek letter cannot be used, the word 'ohm' may be used instead.

Realization

The ohm is realized using the quantum Hall effect.

See also

• Siemens (unit)
• Electrical resistivity and conductivity
• Resistor
• Ohm's law

References

Ohm Resources
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