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Capacitance varies when different materials are inserted or removed between the 2 plates of a capacitor. For example the capacitance increases when air is replaced by a dielectric (like the plastic foil of the foil capacitor or other insulators). | Capacitance varies when different materials are inserted or removed between the 2 plates of a capacitor. For example the capacitance increases when air is replaced by a dielectric (like the plastic foil of the foil capacitor or other insulators). | ||
In old radios variable capacitors with a rotary knob are found that look similar to a potentiometer. You can recognize plastic foils and thin metal plates which move when the knob is turned. ([ | In old radios variable capacitors with a rotary knob are found that look similar to a potentiometer. You can recognize plastic foils and thin metal plates which move when the knob is turned. ([[wikipedia:Variable capacitor|Example images on wikipedia]]) | ||
== Typical usage of Capacitors == | == Typical usage of Capacitors == |