Electrical resonance

Electrical resonance occurs in an electric circuit at a particular resonance frequency when the impedance between the input and output of the circuit is at a minimum (or when the transfer function is at a maximum). Often this happens when the impedance between the input and output of the circuit is almost zero and when the transfer function is close to one.
Resonant circuits exhibit ringing and can generate higher voltages and currents than are fed into them. They are widely used in wireless transmission for both transmission and reception

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