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Give any one defination of power factor....

Give any one defination of power factor.

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The power factor of a circuit is defined in one of the following ways:
i. Power factor`=cosphi=`cosine of the angle of lead or lag
ii. `"Power factor"=(R)/(S)=("Resistance")/("Impedance")`
iii. `"Power factor"=(VIcosphi)/(VI)=("True power")/("Apparent power")`
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