View source for Abohm

{{Short description|Unit of electrical resistance in emu-cgs system}}
{{Infobox
| above   = abohm
| label2 = [[System of measurement|Unit system]]     |   data2 = [[Centimetre–gram–second system of units#Electromagnetic units (EMU)|CGS-EMU]]
| label3 = Unit of    |  data3 = [[electrical resistance]]
| label4 = Symbol      |   data4 = abΩ
| label5 = Named after      |   data5 = [[Georg Ohm]]
| label6 = In CGS base units      |   data6 = cm/s
| header7 = Conversions
| data8 =  <tr class="nowrap"><td>{{val|1|u=abΩ}} ''in ...''</td><td>''... corresponds to ...''</td></tr>
| label9 = &nbsp;&nbsp;&nbsp;SI units | data9 = {{val|e=-9|u=Ω}}
}}
The '''abohm''' is the [[Centimetre–gram–second system of units#CGS approach to electromagnetic units|derived]] unit of electrical resistance in the [[Centimetre–gram–second system of units#Electromagnetic units in various CGS systems|emu-cgs ''(centimeter-gram-second)'']] system of units (emu stands for "electromagnetic units"). One abohm corresponds to 10<sup>−9</sup>&nbsp;[[ohm]]s in the [[International System of Units|SI system of units]], which is a [[Nano-|nano]]ohm.
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 [[Heaviside–Lorentz units]]. In these other systems, the abohm is ''not'' one of the units.
When a current of one [[abampere]] (1&nbsp;abA) flows through a resistance of 1&nbsp;abohm, the resulting potential difference across the component is one [[abvolt]] (1&nbsp;abV).
The name abohm was introduced by [[Arthur E._Kennelly|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.<ref>A.E. Kennelly (1903) [https://dokumen.tips/documents/magnetic-units-and-other-subjects-that-might-occupy-attention-at-the-next-international.html "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''</ref> The abohm was [[Coherence_(units_of_measurement)|coherent]] with the emu-cgs system, in contrast to the ohm, the [[Centimetre–gram–second_system_of_units#Practical CGS units|practical unit]] of resistance that had been adopted too in 1875.
== See also ==
* [[Electrical resistance]]
* [[Statohm]]
==References==
* ''The McGraw Hill Dictionary Of Scientific and Technical Terms'', {{ISBN|0-07-045257-1}}.
{{Reflist}}
[[Category:Units of electrical resistance]]
[[Category:Centimetre–gram–second system of units]]
{{CGS units}}
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