The power factor of an a.c. circuit is givne by `cos phi =`

Average power of an a.c. circuit is:

The power factor of an a.c. circuit is 0.5. what will be the phase difference between voltage and the current?

The power factor of an a.c. circuit having resistance R and indctace L (connected in series) and an angular velocity omega

Under what conditions, power factor of an a.c. circuit is maximum ?

The power in ac circuit is given by P=E_(rms)I_(rms)cosphi . The vale of cos phi in series LCR circuit at resonance is:

What is meant by power factor of an ac circuit?