mhos

A mho is a unit of electrical conductance, the reciprocal of electrical resistance. The mho is represented by the symbol $\mho$ (an inverted omega). It is equivalent to siemens (S), which is the SI unit for electrical conductance. One mho is defined as the conductance of a conductor when a potential difference of one volt causes a current of one ampere to flow through it. Therefore, mho = ampere/volt. The concept of conductance is useful when analyzing electrical circuits, particularly in parallel configurations where the total conductance is the sum of individual conductances. Conversely, resistances in parallel are more complex to sum. The term "mho" was coined by Professor Sir William Thomson (Lord Kelvin) in the late 19th century as a direct opposite to "ohm," the unit of resistance. While the mho was widely used historically, the siemens is now the internationally accepted standard unit. However, the mho may still be encountered in older texts or specific contexts.