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单词 resonant circuit
释义 resonant circuit
A reactive circuit (see reactance) so arranged that it is capable of resonance. In a series resonant circuit a resistor, inductor, and capacitor are arranged in series. Resonance occurs when the impedance (Z) is a minimum and the current amplitude therefore a maximum. In a parallel resonant circuit the inductance and capacitance are in parallel and resonance (with minimal current amplitude) occurs at maximum impedance. The frequency at which resonance occurs is called the resonant frequency . In a series resonant circuit
z = r + i[ωl - 1/ωC]
, where
ω = 2πf
and f is the frequency, R is the resistance, L is the inductance, and C is the capacitance. At resonance, Z is a minimum and
ωL = 1/ωC
, i.e. the circuit behaves as if it is purely resistive. In the parallel circuit, resonance occurs when
R2 + ω2L2 = L/C
, which in most cases also approximates to
ωL = 1/ωC
. Resonant circuits are widely used in radio to select one signal frequency in preference to others
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更新时间:2025/6/23 18:20:54