The abohm is the derived unit of electrical resistance in the emu-cgs (centimeter-gram-second) system of units (emu stands for "electromagnetic units"). One abohm is equal to 10−9 ohms in the SI system of units; one abohm is a nanoohm.

The emu-cgs (or "electromagnetic cgs") units are one of several systems of electromagnetic units within the centimetre gram second system of units; others include esu-cgs, Gaussian units, and Lorentz–Heaviside units. In these other systems, the abohm is not one of the units.

When a current of one abampere (1 abA) flows through a resistance of 1 abohm, the resulting potential difference across the component is one abvolt (1 abV).

The name abohm was introduced by Kennelly in 1903 as a short name for the long name (absolute) electromagnetic cgs unit of resistance that was in use since the adoption of the cgs system in 1875.[1] The abohm was coherent with the emu-cgs system, in contrast to the ohm, the practical unit of resistance that had been adopted too in 1875.

The McGraw Hill Dictionary Of Scientific and Technical Terms, ISBN 0-07-045257-1.

A.E. Kennelly (1903) "Magnetic units and other subjects that might occupy attention at the next international electrical congress" 20th Annual Convention of the American Institute of Electrical Engineers, 1903

CGS units
Base units

centimetre gram second

Derived non EM units

barye dyne erg gal kelvin poise phot stilb

Derived EMU units

abampere abcoulomb abhenry abmho abohm abvolt biot gauss gilbert maxwell oersted

Derived ESU units

statcoulomb statmho statohm statvolt

Physics Encyclopedia



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