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What is meant by resonance in a series L...

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.

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In a series LCR circuit for a particular frequency of the applied a.c. the current in the circuit becomes maximum. This is known as electrical resonance.
At resonance, inductive reactance `(X_(L))` = capacitive reactanmce `(X_(C))`
`rArr omega_(0)L = (1)/(omega_(0)C)`
Thus resonant angular frequency
`omega_(0) = (1)/(sqrt(LC))`
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