farad
SI unit of electrical capacitance (how much electric charge a capacitor can store for a given voltage). One farad is a capacitance of one coulomb per volt. For practical purposes the microfarad (one millionth of a farad, symbol μF) is more commonly used.
| The farad is named after English scientist Michael Faraday, and replaced the now obsolete unit the jar (so called because it represented the charge stored in a Leiden jar, the earliest electrical circuit). One farad equals 9 × 108 jars. |
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