AnRLC circuit(orLCR circuit) is anelectrical circuitconsisting of aresistor, an inductor, and a capacitor, connected in series or in parallel. The RLC part of the name is due to those letters being the usual electrical symbols forresistance,inductanceandcapacitancerespectively. The circuit forms aharmonic oscillatorfor current andresonatessimilarly to anLC circuit. The main difference stemming from the presence of the resistor is that any oscillation induced in the circuit decays over time if it is not kept going by a source. This effect of the resistor is calleddamping. The presence of the resistance also reduces the peak resonant frequency ofdampedoscillation, although the resonant frequency fordrivenoscillations remains the same as an LC circuit. Some resistance is unavoidable in real circuits, even if a resistor is not specifically included as a separate component. A pure LC circuit is an ideal that exists only intheory.

An important application is for tuning, such as in radio receivers or television sets, where they are used to a narrow range of frequencies from the ambient radio waves.

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