What is a RC, LR, LC and LCR circuits ?

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Solution

RC - An RC circuit is made of a resistor and capacitor in series. It exhibits charging behaviour with characterisitic time constant with DC voltage source. It acts as a high pass filter (allows high frequency currents, but not low frequency currents) in AC circuits.

LR - An LR circuit has a resistor and an inductor in series. It acts as a short with a DC voltage source, but smooths out rapid variations in current. It acts as a low pass filter (allows low frequency currents, but not high frequency currents) in AC circuits.

LC - An LC circuit has an inductor and capacitor in series. If initially charged, it has oscillitory behaviour. It has resonant behaviour with AC driving voltage.

LCR - An LCR circuit has an inductor, capacitor and a resistor in series. If initially charged it produces damped oscillations.

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