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Reference.org
Variable capacitor
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<p>A variable capacitor is a <a href="/facts/Capacitor/hyowqv7n">capacitor</a> whose capacitance may be intentionally and repeatedly changed mechanically or electronically. Variable capacitors are often used in <a href="/facts/LC_circuit/tzEfI7Hf">L/C circuits</a> to set the resonance frequency, e.g. to tune a radio (therefore it is sometimes called a tuning capacitor or tuning condenser), or as a variable <a href="/facts/Reactance_(electronics)/LnvyrUnM">reactance</a>, e.g. for <a href="/facts/Impedance_matching/0mdy9TAp">impedance matching</a> in <a href="/facts/Antenna_tuner/ExtH4QI2">antenna tuners</a>. </p>