Page 406 - Basic Electrical Engineering

If we neglect the small value of R, f for series and parallel resonance is
0
the same.

If we have a constant frequency supply source, a resonance condition can
also be achieved if we change the value of L or C creating a condition when

A resonance condition is created in tuning circuits of radio receiver sets by
adjusting the values of circuit parameters.

Example 3.40 An inductive coil has a resistance of 10 Ω and inductance of
100 mH. This coil is connected in parallel with a capacitor of 20 μF. A
variable frequency power at 100 V is applied across this parallel circuit.

Calculate the frequency at which the circuit will reasonate. Also calculate the
Q-factor, dynamic impedance of the circuit, and resonant current.

Solution:

Resonant frequency,

Substituting the given values,

Dynamic impedance,