# Resonance and its applications

For a series resonant circuit, Since

Since the impedance is low, the circuit readily accepts current; it is known as an acceptor circuit. Voltage magnification (magnification factor, Q) is the ratio

For a parallel resonant circuit, approximately. Impedance at the resonant frequency = and is termed the dynamic resistance (RD). Since the impedance is high, the circuit does not readily accept current; it is known as a rejector circuit. Current magnification is the ratio

On a response curve, the bandwidth is measured at 70.7% of the maximum response.

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