Contents
What is the resistance offered by the parallel resonant circuit at resonance?
So the total impedance of a parallel resonance circuit at resonance becomes just the value of the resistance in the circuit and Z = R as shown. Also at resonance, as the impedance of the circuit is now that of resistance only, the total circuit current, I will be “in-phase” with the supply voltage, VS.
What causes parallel resonance?
Parallel resonance occurs when the impedance to current flow at a certain frequency (or frequencies) is high. Even a small increase in impedance at these frequencies due to resonance can lead to unacceptable voltages being produced at these same frequencies.
When does resonance occur in a parallel LC circuit?
Resonance occurs when capacitive and inductive reactances are equal to each other. For a tank circuit with no resistance (R), resonant frequency can be calculated with the following formula The total impedance of a parallel LC circuit approaches infinity as the power supply frequency approaches resonance.
What is the maximum resistance of a series resonant circuit?
Resistance in series resonant circuit leaves current maximum at calculated 159.2 Hz, broadening the curve. Note that the peak of the current graph (Figure below) has not changed from the earlier series LC circuit (the one with the 1 Ω token resistance in it), even though the resistance is now 100 times greater.
Which is the parallel equivalent of the coil resistance?
The parallel equivalent of the coil resistance is: There is no other resistor in parallel with the inductor and capacitor, therefore the equivalent parallel resistance, Rp, is the total resistance of the circuit, RT. Consequently, the Q of the circuit must be the same as Qcoil.
How does added resistance affect the resonant peak?
The tendency for added resistance to skew the point at which impedance reaches a maximum or minimum in an LC circuit is called antiresonance. The astute observer will notice a pattern between the four SPICE examples given above, in terms of how resistance affects the resonant peak of a circuit: