abohm | |
---|---|

Unit system | emu-cgs |

Unit of | Electrical resistance |

Symbol | abΩ |

Named after | Georg Ohm |

Derivation | abV/abA |

Conversions | |

1 abΩ in ... | ... is equal to ... |

CGS base units | cm⋅s^{3} |

SI units | 10^{−9} Ω |

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.