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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.
Capacitors are meant to hold electrons on one plate (and repel electrons from the other) while NOT passing a current between the plates. If current is allowed to pass between the plates than the capacitor has failed. A capacitor is made up of two isolated plates held apart by a non-conductive material (usually oils). If the oil has been broken down or exposed to a significantly large voltage, electrons will begin to jump the gap between the two plates. At this point the capacitor has failed.