Note:  Do not rely on this information. It is very old.

Farad

Farad, in Electricity, is the unit of electrical capacity. A condenser (q.v.) has that capacity when a charge of one coulomb of electricity brings it to a potential of one volt. Such a capacity is enormous, and' a much smaller practical unit is therefore desirable. On this account the microfarad is used; it is the millionth part of a farad. [Electricity.]