The power factor of a circuit is defined in one of the following ways:

Power factor

The power factor of a circuit is defined in one of the following ways:

(i) Power factor = cos Ï• = cosine of the angle of lead or lag

(ii) Power factor = *R/Z* = Impedance / Resistance

(iii) Power factor = *VI* cos Ï† / VI

= True power / Apparent power

Some examples for power factors:

(i) Power factor = cos 0Â° = 1 for a pure resistive circuit because the phase angle *Ï•* between voltage and current is zero.

(ii) Power factor = cos(Â±Ï€ /2 )= 0 for a purely inductive or capacitive circuit because the phase angle *Ï•* between voltage and current is Â±Ï€ /2 .

(iii) Power factor lies between 0 and 1 for a circuit having *R*, *L* and *C* in varying proportions.

Tags : Power in AC Circuits , 12th Physics : Electromagnetic Induction and Alternating Current

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12th Physics : Electromagnetic Induction and Alternating Current : Power factor | Power in AC Circuits

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