![]() This phenomenon occurs when the reactances of the inductor and the capacitor are equal and because of their opposite signs, they cancel each other (the canceling can be observed on the right phasor diagram below). In other words, if the impedance is purely resistive (or real). The resonance occurs at the frequency at which the impedance of the circuit is at its maximum, that is, if there is no reactance in the circuit. Right: A graph of the parallel RLC circuit impedance Z RLC and the phase shift between the total voltage and the total current φ against frequency f The values of the resistance, inductance, and capacitance are selected so that the resonant frequency is the same for all graphs. Left: A graph of the parallel RLC circuit impedance Z RLC against frequency f for a given resistance, inductance and capacitance.
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