What is meant by resonance in a series LCR circuit? Write the expression for the current through LCR series circuit at resonance. Mention any one application of resonant circuits.

Explanation

Resonance in series LCR circuit.
The phenomenon of impedance of the series LCR circuit becoming minimum and current in the circuit becoming maximum at a particular frequency of applied alternating voltage is called electrical resonance.
Expression for current through LCR series circuit at resonance is
`I_("max")=V/R`
Applications of resonant circuit
Resonant circuits used
1. As voltage amplifier
2. As filters
3. In the tuning mechanism of a radio or a television set.