Resonance in RLC Bandwidth Radio tuning circuit in tamil

Bandwidth (BW): The bandwidth is defined as the range of frequency at the limits of which the current is equal to or greater than 70.7% of maximum current.
The frequency f1 and f2 are called as half power points or frequency. They are also referred to as cut-off frequencies. The bandwidth is an indication of sharpness or degree of tuning.
Importance of Q-Factor:
The Q-factor of series a.c circuit indicates how many times the p.d across L or C is greater than the applied voltage at resonance. For example, consider an R.L.C series circuit connected to 240V a.c source. If Q-factor of the coil is 20, then voltage across L or C will be 20x240 = 4800V at resonance i.e VC = VL = Q VR = 20 x 240 = 4800 V.
Resonance:
Inductive reactance increases as the frequency is increased, but capacitive reactance decreases with higher frequencies. Because of these opposite characteristics, for any LC combination there must be a frequency at which the XL equals the XC as one increases while other decreases. This case of equal and opposite reactance is called resonance and this circuit is called as resonance circuit.
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