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The ohm (symbol: Ω) is the SI unit of electrical impedance or, in the direct current case, electrical resistance, named after Georg Ohm.

- $Omega\; =\; dfrac\{mbox\{V\}\}\{mbox\{A\}\}\; =\; dfrac\{mbox\{m\}^2\; cdot\; mbox\{kg\}\}\{mbox\{s\}^\{3\}\; cdot\; mbox\{A\}^2\}$

In many cases the resistance of a conductor in ohms is approximately constant within a certain range of voltages, temperatures, and other parameters; one speaks of linear resistors. In other cases resistance varies (e.g., thermistors).

The most commonly used multiples and submultiples in electrical and electronic usage are the milliohm, ohm, kilohm, and megohm.

- The SI unit of electrical conductance is the siemens, formerly known as the mho (ohm written backwards); it is the reciprocal of resistance in ohms.

- $P=\{V^2\; over\; R\}=\{I^2\; cdot\; R\}$

This formula is not applicable to devices whose resistance varies with current.

- Scanned books of Georg Simon Ohm at the library of the University of Applied Sciences Nuernberg
- Official SI brochure
- NIST Special Publication 811
- History of the ohm at sizes.com

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Last updated on Thursday October 09, 2008 at 15:30:47 PDT (GMT -0700)

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This article is licensed under the GNU Free Documentation License.

Last updated on Thursday October 09, 2008 at 15:30:47 PDT (GMT -0700)

View this article at Wikipedia.org - Edit this article at Wikipedia.org - Donate to the Wikimedia Foundation

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