^LC R parallel circuit or rejecter circuit

^LC R parallel circuit or rejecter circuit

Reciprocal of impedance Z is called admittance Y. Current delivered by the supply is I = I1 + I2

If the source oscillates at angular frequency  then imaginary part of Y becomes zero & Y is minimum. This stage is called resonance. Following points are of interest at resonance.

1. The reciprocal of the minimum value of Y is called the parallel or dynamic resistance, it is

2. Peak current through supply

3. Peak current through

4. Q – factor or current magnification i.e. the ratio of the peak current through supply to that through

5. Used as transmitting circuits.

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