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A capacitor is a passive device on a circuit board that stores electrical energy in an electric field by virtue of accumulating electric charges on two close surfaces insulated from each other. This is a list of known capacitor manufacturers, their headquarters country of origin, and year founded. The oldest capacitor companies were founded ...
Tantalum electrolytic capacitors—US$2.2 billion (12%); Super capacitors (Double-layer capacitors)—US$0.3 billion (2%); and; Others like silver mica and vacuum capacitors—US$0.7 billion (3%). All other capacitor types are negligible in terms of value and quantity compared with the above types.
Capacitors used for suppressing undesirable frequencies are sometimes called filter capacitors. They are common in electrical and electronic equipment, and cover a number of applications, such as: Glitch removal on direct current (DC) power rails; Radio frequency interference (RFI) removal for signal or power lines entering or leaving equipment
Combining the equation for capacitance with the above equation for the energy stored in a capacitor, for a flat-plate capacitor the energy stored is: = =. where is the energy, in joules; is the capacitance, in farads; and is the voltage, in volts.
The voltage at which this occurs is called the breakdown voltage of the device, and is given by the product of the dielectric strength and the separation between the conductors, [35] = The maximum energy that can be stored safely in a capacitor is limited by the breakdown voltage.
A capacitor with the following text on its body: 105K 330V has a capacitance of 10 × 10 5 pF = 1 μF (K = ±10%) with a working voltage of 330 V. A capacitor with the following text: 473M 100V has a capacitance of 47 × 10 3 pF = 47 nF (M = ±20%) with a working voltage of 100 V.