Definition
The unit of electrical conductance in the centimeter-gram-second (CGS) electromagnetic system of units. One abmho equals one billion (10^9) mhos, or one billion siemens, in the modern International System of Units. Conductance is the reciprocal of resistance, so the abmho is the reciprocal of the abohm, the CGS unit of resistance.
Plain English
An old scientific unit that measures how easily electricity flows through something. It is the opposite of resistance — the higher the abmho value, the more freely current passes.
Context Anchor
Seen mainly in older electrical theory references, older maintenance texts, or aviation dictionaries, rather than in normal cockpit use.
Derivation
Built from 'ab-' (a prefix meaning 'absolute', used to mark CGS electromagnetic units) and 'mho' (the word 'ohm' spelled backwards, since conductance is the reverse of resistance). So 'abmho' literally signals 'the absolute-system reciprocal of the ohm.'
Why Pilots Care
A pilot is unlikely to use abmho in everyday flying, but recognizing it can prevent confusion when reading older aircraft electrical material or maintenance references.
Intuition Check
Do not treat abmho as an aircraft part or cockpit item. It is a measurement unit for electrical conductance.
Example Sentence 1
An older avionics textbook listed the wire's conductance in abmhos, which the technician converted to siemens before applying it to the modern circuit calculation.
Example Sentence 2
Older aircraft maintenance records sometimes listed component values in abmhos before modern units became standard.