Electrical Engineering ⇒ Topic : Qfactor of a Parallel Resonant Circuit

Seema
 
Qfactor of a Parallel Resonant Circuit At parallel resonance, the line current drawn from the supply is I_{r}(= V/Z_{r}) which is in phase with supply voltage V. Also Ir is very much less than I_{L }and I_{c},. 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 Qfactor or current magnification factor of a parallel resonant circuit is the ratio of I_{c }*(not I_{L}) to the line current I_{r }i.e. Note that expression for Qfactor is the same as the Q factor for a series resonant circuit i. e. Q is once again the Qfactor of the coil. Neglecting R, the value of resonant frequency f_{r} is This is the expression for the Qfactor in terms of R, L and C.  
 
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