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In parallel resonance current is
Minimum
Maximum
Both of these
None of these
Minimum
In an ideal parallel resonant circuit (tank circuit), the circuit impedance is purely resistive and maximum at resonance. Consequently, since current I=ZVтАЛ, the line current drawn from the source becomes minimum because the impedance offered to the source is at its peak.
In an ideal parallel resonant circuit (tank circuit), the circuit impedance is purely resistive and maximum at resonance. Consequently, since current I=ZVтАЛ, the line current drawn from the source becomes minimum because the impedance offered to the source is at its peak.
frтАЛ=2╧А1тАЛLC1тАЛтИТL2R2тАЛтАЛ тАФ Resonant frequency of parallel circuit
ZmaxтАЛ=RCLтАЛ тАФ Dynamic impedance at resonance
IminтАЛ=ZmaxтАЛVтАЛ тАФ Minimum line current at resonance
At parallel resonance, the inductive susceptance (BLтАЛ) exactly cancels the capacitive susceptance (BCтАЛ). This results in zero reactive current flowing from the external source, leaving only the conductance component. The entire energy oscillates between the capacitor and inductor, forcing the source to supply only the energy dissipated by the resistance, which corresponds to a minimum current condition.
At resonance, the parallel circuit behaves as a pure resistance.
The power factor of the parallel circuit at resonance is unity (1.0).
Line current is in phase with the applied voltage.
The circuit provides high impedance to the source at the resonant frequency.
Used for selective amplification in radio tuning circuits
Acts as a wave trap or rejector circuit
High impedance might lead to high voltage stresses across components
Requires precise component matching for sharp resonance
Radio frequency (RF) tuning circuits
Oscillators and filter designs
Induction heating systems
In series resonance, the impedance is minimum and current is maximum.
Option B is incorrect because maximum current occurs in series resonance, not parallel resonance.
A is correct тАФ The line current is minimum in a parallel resonant circuit because the circuit impedance reaches its maximum value at the resonant frequency.
Always remember the mnemonic: Series = Low Z, High I; Parallel = High Z, Low I.