|n.||1.||a device used in electronic circuits to hold electrical charge, consisting of two conducting plates separated by a nonconducting (dielectric) medium; it is characterized by its capacitance.|
|Noun||1.||capacitor - an electrical device characterized by its capacity to store an electric charge|
|(electronics)||capacitor - An electronic device that can store electrical
charge. The charge stored Q in Coulombs is related to the
capacitance C in Farads and the voltage V across the capacitor
in Volts by Q = CV.|
The basis of a dynamic RAM cell is a capacitor. They are also used for power-supply smoothing (or "decoupling"). This is especially important in digital circuits where a digital device switching between states causes a sudden demand for current. Without sufficient local power supply decoupling, this current "spike" cannot be supplied directly from the power supply due to the inductance of the connectors and so will cause a sharp drop in the power supply voltage near the switching device. This can cause other devices to malfunction resulting in hard to trace glitches.