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Symbol Ω. The derived SI unit of electrical resistance, being the resistance between two points on a conductor when a constant potential difference of one volt, applied between these points, produces a current of one ampere in the conductor. The former international ohm (sometimes called the ‘mercury ohm’) was defined in terms of the resistance of a column of mercury. The unit is named after Georg Ohm (1787–1854).

Subjects: Chemistry.

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