Resonance: Resonance
is a phenomenon which occurs in ac circuits containing all the three elements
R,L,C. The radio or television receiver is tuned to this resonant frequency to
obtain signals from that particular station.
The resonant
condition in ac circuits may be achieved by varying the frequency of the
supply, keeping the network elements constant or by varying L or C, keeping the
frequency constant, there are two types of resonant circuits.
1) Series
resonant circuit
2) Parallel
resonant circuit.
The frequency response curve or the
resonant curve is also known as the selectivity curve, because a resonant
circuit is always adjusted to select a band of frequencies lying between f1&f2,
. f1&f2,are called as half power frequencies.
The smaller the band width, higher
the selectivity or a circuit having a low value of bandwidth is said to be
highly selective.
The phenomenon of parallel
resonance is of great practical importance because it form the basis of tuned
circuits in electronics.
Parallel resonance: The
basic condition of resonance i.e, power factor of the entire circuit being
unity remains the same for parallel circuits also. Thus resonance will occur in
a parallel circuit,
At resonance
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