Resonant Frequency Formula

The resonant frequency is the frequency of a resonant circuit. The other name of the resonance circuit is a tank circuit of LC circuit. The resonant circuit consist of a parallel-connected capacitor and inductor in it. In order to generate a specific frequency or to consider a specific frequency from the complicated circuit a resonant circuit is being used. The formula of resonant frequency is

\(f_{o}=\frac{1}{2\pi \sqrt{LC}}\)


fo = resonant frequency in Hz

L = Inductance

C = Capacitance

Resonant Frequency Solved Examples

Problem 1: Determine the resonant frequency of a circuit whose inductance is 35mH and capacitance is 10μF?



L = 35mH and

C = 10μF

The resonant frequency formula

\(f_{o}=\frac{1}{2\pi \sqrt{LC}}\)

\(f_{0} = \frac{1}{2\times 3.14\times \sqrt({35\times 10^{-3}}\times 10\times 10^{-6})}\)


f0 = 269.16 Hz

Problem  2: The capacitance and inductance of a resonant circuit are given as 0.5F and 1H. Calculate the resonant frequency of the circuit?



L = 1H and

C = 0.5F

The formula for resonant frequency is

\(f_{o}=\frac{1}{2\pi \sqrt{LC}}\)

\(f_{o}=\frac{1}{2\times 3.14\times \sqrt{1\times 0.5}}\)


f0 = 0.2251Hz

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