The abohm is the basic unit of electrical resistance in the emu-cgs system of units (emu stands for "electromagnetic units"). One abohm is equal to 10^-9 ohm

Ohm

The ohm is the SI unit of electrical resistance, named after German physicist Georg Simon Ohm.- Definition :The ohm is defined as a resistance between two points of a conductor when a constant potential difference of 1 volt, applied to these points, produces in the conductor a current of 1 ampere,...

s in the SI system of units

International System of Units

The International System of Units is the modern form of the metric system and is generally a system of units of measurement devised around seven base units and the convenience of the number ten. The older metric system included several groups of units...

; one abohm is a nano

Nano

Nano- is a prefix meaning a billionth. Used primarily in the metric system, this prefix denotes a factor of 10−9 or . It is frequently encountered in science and electronics for prefixing units of time and length, such as 30 nanoseconds , 100 nanometres or in the case of electrical capacitance,...

ohm.

The emu-cgs (or "electromagnetic cgs") units are one of several systems of electromagnetic units within the centimetre gram second system of units

Centimetre gram second system of units

The centimetre–gram–second system is a metric system of physical units based on centimetre as the unit of length, gram as a unit of mass, and second as a unit of time...

; others include esu-cgs, Gaussian units

Gaussian units

Gaussian units comprise a metric system of physical units. This system is the most common of the several electromagnetic unit systems based on cgs units. It is also called the Gaussian unit system, Gaussian-cgs units, or often just cgs units...

, and Lorentz–Heaviside units. In these other systems, the abohm is not one of the units.

When a current of one abampere

Abampere

The abampere , also called the biot after Jean-Baptiste Biot, is the basic electromagnetic unit of electric current in the emu-cgs system of units . One abampere is equal to ten amperes in the SI system of units...

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

Abvolt

The abvolt is one option for the unit of potential difference in the CGS system of units, and is equal to 10−8 volts in the SI system.A potential difference of 1 abV will drive a current of one abampere through a resistance of one abohm....

(1 abV).