LC Circuit

An LC circuit is an electric circuit that consists of an indicator expressed by L and capacitor by C both connected in a single circuit. The circuit serves as an electrical resonator which is a tuning fork analog that stores energy which oscillates at the circuit’s resonant frequency.

LC Circuit

LC circuits are utilized either to pick out a signal at the certain frequency by the complex signal or producing signals at the certain frequency. LC circuits act as major components in various electronic devices like radio equipment, in circuits like filters, oscillators, and tuners.

LC circuit is an ideal model which assumes that energy dissipation doesn’t occur due to resistance. Any implementation involves loss because of the small electrical resistance in the connecting wires or components. The primary purpose of LC circuit is to oscillate by minimum damping to make the resistance as minimum as possible.  No circuit can work without any loss and it is instructive to know this kind of circuits to gain physical intuition.


The above di elemental LC circuit shows the basic kind of inductor-capacitor network. It is also expressed as a second order LC circuit to differentiate it from highly complicated LC networks that have more capacitors and inductors. These LC networks that consist of more than two reactances can consist of higher resonant frequency.

The network order is an order of rational function which describes the network in complex frequency variables s. The order generally equals the number of L and C elements of the circuit and cannot exceed in any event.

Applications of LC Circuit

The resonance effects of LC circuits have various applications which are important in communication systems and signal processing.

  • Tuning radio transmitters and receivers are the most common application of tank circuits. For instance, when you tune a radio to some station, the LC circuits set a resonance for that carrier frequency.
  • A parallel resonant circuit yields current magnification.
  • A series resonant circuit yields voltage magnification.
  • Both series and parallel resonant circuits are utilized in induction heating.

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