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The effect of a capacitor is known as capacitance.
While some capacitance exists between any two electrical conductors in proximity in a circuit, a capacitor is a component designed to add capacitance to a circuit.
The capacitor was originally known as the condenser,[1] a term still encountered in a few compound names, such as the condenser microphone.
The physical form and construction of practical capacitors vary widely and many types of capacitor are in common use.
Most capacitors contain at least two electrical conductors, often in the form of metallic plates or surfaces separated by a dielectric medium.
A conductor may be a foil, thin film, sintered bead of metal, or an electrolyte.