Electrical Engineering ⇒ Topic : Q-factor of a Parallel Resonant Circuit
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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