Question

Define the term resonant frequency.

Answer 1

Resonant frequency (f_r) is the frequency of the AC source at which the inductive reactance becomes equal to the capacitive reactance (XL = XC). At this frequency, the impedance of the series LCR circuit is minimum and equal to the resistance (Z = R), resulting in maximum current.

f_r = `1/(2 pi sqrt(L C))`