The graph given below depict the dependence of two reactive impedances X₁ and X₂ on the frequency of the alternating emf applied individually to them. Then we can say that :

${\mathrm{X}}_{\mathrm{c}}=\frac{1}{\mathrm{\omega C}} \mathrm{and} {\mathrm{X}}_{\mathrm{l}}=\mathrm{\omega L}$

Impedance of Capacitor inversely proportional to frequency, where impedance for inductor directly proportional to frequency.

${\mathrm{X}}_1\mathrm{is} \mathrm{a} \mathrm{capacitor} \mathrm{and} {\mathrm{X}}_2 \mathrm{is} \mathrm{an} \mathrm{inductor}$