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Engineering Science by Lloyd Dingle, Mike Tooley

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Chapter 27 Resonant circuits

27.1 Series resonant circuits

Circuits that contain only a combination of resistance and capacitance or only a combination of resistance and inductance are ‘non-resonant’ because the voltage and current will not be in phase at any frequency (other than zero in the case of an inductance or infinity in the case of a capacitance!). More complex circuits, containing both types of reactance together with resistance, are described as ‘resonant’ since there will be one frequency at which the two reactive components will be equal but opposite. At this particular frequency (known as the resonant frequency) the effective reactance ...

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