Electrical Engineering ⇒ Topic : Q-factor of a Parallel Resonant Circuit
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Seema
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Q-factor of a Parallel Resonant Circuit At parallel resonance, the line current drawn from the supply is Ir(= V/Zr) which is in phase with supply voltage V. Also Ir is very much less than IL and Ic,. Thus in a parallel resonant circuit, there is a current amplification which is analogous to the voltage amplification that occurs in a series resonant circuit. The Q-factor or current magnification factor of a parallel resonant circuit is the ratio of Ic *(not IL) to the line current Ir i.e. Note that expression for Q-factor is the same as the Q factor for a series resonant circuit i. e. Q is once again the Q-factor of the coil. Neglecting R, the value of resonant frequency fr is This is the expression for the Q-factor in terms of R, L and C. | |
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