# ab- aΩ

#### (Latin: prefix; indicating electromagnetic units of the centimeter-gram-second system)

abampere (ab AM pir") (s) (noun), abamperes (pl)
A basic unit of electric current in the meter-kilogram-second system: One abampere is equal to ten amperes in the SI system of units, or the Système International [d'Unités], or the International System [of Units].

One abampere equals 10 amperes in the absolute meter-kilogram-second-ampere system.

abampere centimeter squared, aAcm2
The unit of magnetic moment in the electromagnetic centimeter-gram-second system.
abampere per square centimeter, aA/cm2
The unit of current density in the electromagnetic centimeter-gram-second system.
abcoulomb (abC, aC) (ab KOO lahm", ab KOO lohm") (s) (noun), abcoulombs (pl)
The unit of electric charge in the electromagnetic centimeter-gram-second system, where one abcoulomb is equal to 10 coulombs.

In the electromagnetic cgs system, electrical current is a fundamental quantity defined via Ampère's law and takes the permeability as a dimensionless quantity (relative permeability) whose value in a vacuum is unity; as a consequence, the square of the speed of light appears explicitly in some of the equations interrelating quantities in this system.

abcoulomb centimeter (s) (noun), abcoulomb centimeters (pl)
In the electromagnetic centimeter-gram-second (cgs) system of units, the unit of electric dipole moment.
abcoulomb per cubic centimeter, aC/cm3
The electromagnetic centimeter-gram-second unit of volume density of charge.
abcoulomb per square centimeter, aC/cm2
The electromagnetic centimeter-gram-second unit of surface density of charge, electric polarization, and displacement.
An electromagnetic unit of capacitance equal to 109 farads (1,000,000,000 F or 1 GF): This very large abfarad is usually limited to applications in medical terminology:

The abfarad was named after the English physicist Michael Faraday who contributed to the study of electromagnetism, the physical interaction that occurs between electrically charged particles; and electrochemistry, the branch of physical chemistry that studies the relationship between electricity, as a measurable and quantitative phenomenon, and identifiable chemical changes.

Michael Faraday (1791-1867) was an English experimental scientist who was especially noted for his discoveries in electricity, including electromagnetic induction, the battery, the electric arc, and the dynamo or an electrical generator that produces direct current.

abhenry, aH (s) (noun), abhenries (pl)
Abhenry is a medical term referring to the centimeter-gram-second electromagnetic unit of inductance, equal to 10-9 or one billionth of a henry (a standard unit of inductance in the meter-kilogram-second system), equivalent to that of an induced 1 volt in the presence of a current that is changing at a rate of 1 ampere per second: When the scientists met, they exchanged notes about their theories of various applications of abhenries.

The term, abhenry, was named for Joseph Henry (1797-1878), a U.S. scientist who discovered the electromagnetic phenomenon of self-inductance, and who also discovered mutual inductance, independently of Michael Faraday. His work on the electromagnetic relay was the basis of the electrical telegraph.

abmho
Formerly, an electromagnetic unit of conductance; replaced by the absiemen.
abohm, aΩ (s) (noun), abohms (pl)
The centimeter-gram-second unit of electrical resistance equal to one billionth of an ohm: Albert found out that the equipment used in the university laboratory could accurately calculate the abohms so he could know more about their accuracy.
absiemen
The centimeter-gram-second electromagnetic unit of conductance; one absiemen is the conductance at which a potential of one abvolt forces a current of one abampere; equal to 109 siemens.

One siemen is the conductance at which a potential of one volt forces a current of one ampere and named for Karl Wilhem Siemens.

Karl Wilhem Siemens (1823-1883) was a German electrical engineer and active in Great Britain as Sir Charles William Siemens. With his brother Ernst, he established many early electrical-engineering projects and manufacturing facilities.

abvolt per centimeter
The centimeter-gram-second electromagnetic unit of electric field strength.
abvolt, aV
1. The centimeter-gram-second electromagnetic unit of electromotive force.

One abvolt is the difference of potential between any two points when one erg of work is required to move one abcoulomb of electricity between them; equal to 10-8 volts.

2. The unit of electromotive force in the electromagnetic centimeter-gram-second system.

One abvolt equals 10-8 volts in the absolute meter-kilogram-second system.

abwatt
The centimeter-gram-second unit of power.