Principle
In an RLC circuit, energy is exchanged periodically between a capacitor and a coil. When the electric field of the capacitor decreases by discharge over the coil, a magnetic field is established in the coil. As soon as the capacitor is completely depleted, the current flow through the coil vanishes. The magnetic field decreases again and the capacitor is charged, again. If this process could run loss-free, the energy would oscillate continuously between capacitor and coil with the resonance frequency, that is depending on the used components. The circuit is called RLC circuit because of the crucial physical properties, the inductance L of the coil, and the capacitance C of the capacitor.
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