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

Chapter: 12th Physics : Electromagnetic Induction and Alternating Current

Power factor

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 ϕ = cosine of the angle of lead or lag

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

(iii) Power factor = VI cos φ / VI

 = True power / Apparent power

Some examples for power factors:

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

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

(iii) Power factor lies between 0 and 1 for a circuit having RL and C in varying proportions.

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


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