Question

How does a series rlc circuit behave for the frequencies above and below resonant frequencies?

Answer 1

Above resonance, if either the frequency or the impedance is increased,the overall inductive reactance value of the inductor would also increase. If frequency te ds to infinity, the inductor reactance would also approach infinity and the circuit element may act like an open circuit.

Similarly,below resonance I.e(f less than Fr), as frequency tends to zero or DC, the inductor reactance would decrease to zero, causing the opposite effect like a short circuit. This leads that the inductive reactance is proportional to the frequency and is small at low frequencies and high at high frequencies.