ab-

   a prefix indicating that an electrical unit is part of the CGS absolute electromagnetic system. These units are also indicated by the notation emu (as in "volt emu"). Although these units are defined naturally as part of the CGS system, all of them except the abampere and abcoulomb are either much too large or much too small for most applications. They have been replaced almost completely by the corresponding SI units. Following are the SI equivalents for each of the "ab" units:
   Electric current: 1 abampere = 10 amperes
   Electric charge: 1 abcoulomb = 10 coulombs
   Capacitance: 1 abfarad = 109 farads = 1 gigafarad
   Inductance: 1 abhenry = 10-9 henry = 1 nanohenry
   Resistance: 1 abohm = 10-9 ohm = 1 nanoohm
   Conductance: 1 abmho = 109 siemens
   Magnetic flux density: 1 abtesla = 10-4 tesla = 1 gauss
   Potential: 1 abvolt = 10-8 volt = 10 nanovolts
   Power: 1 abwatt = 10-7 watt = 0.1 microwatt
   Magnetic flux: 1 abweber = 10-8 weber = 1 maxwell.

Dictionary of units of measurement. 2015.

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