Value of power factor of L.C.R circuit which is in the state of resonance?

- At resonance, Inductive resistance (XL) is equal to capacitive resistance (Xc)
- The Power factor is nothing but cosine of phase angle between voltage and current.
- For RLC circuit, the pf is also given by

- Therefore, the value of power factor of L.C.R circuit which is in the state of resonance is unity (one).