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The smallest capacitors (made from ceramic, film, or tantalum) use units of picofarads (pF), equal to 10-12 farads. Larger capacitors (the cylindrical aluminum electrolyte type or the double-layer type) use units of microfarads (uF or ÂµF), equal to 10-6 farads.
When the circuit is switched off, a capacitor retains the energy it has gathered, though slight leakage usually occurs. A variety of capacitors (shown in color) in circuit board. Capacitance is expressed as the ratio of the electric charge on each conductor to the potential difference (i.e., voltage) between them. The capacitance value of a capacitor is measured in farads (F), units named for English physicist Michael Faraday (1791â1867). A farad is a large quantity of capacitance. Most household electrical devices include capacitors that produce only a fraction of a farad, often a thousandth of a farad (or microfarad, ÂµF) or as small as a picofarad (a trillionth, pF).