What is parallel resonant circuit

The phenomenon of resonance occurs both in case of parallel and series circuit which is supplied by an alternating ac source. Resonant circuit consists of these components - R , L and C . In the parallel RLC circuit the condition for resonance occurs when the susceptance part is zero.

rcHowever admittance Y = G + j B
= 1 / R + j ω C + 1 / j ω L
= 1 / R + j (ωC - 1/ω L)

The frequency at which resonance occurs is ω0 C - 1 / ω0 L = 0
ω0 = 1/ √LC
At resonant frequency current becomes maximum .
A parallel resonating circuit is also called rejector circuit or anti-resosnant circuit. Another common name is tuned circuit .

Properties of resonance of parallel RLC circuit are given below :

  • Power factor is unity
  • Current at resonance is [V / (L /CR)] and is in phase with applied voltage.The value of current at resonance is minimum.
  • Net impedance at parallel circuit is maximum and equal to (L/CR) Ω .
  • The admittance is minimum and net susceptance is zero at resonance
  • The susceptance frequency of the circuit is given as f0 = 1/ 2π √ (1/ LC - R2 / L2)

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