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Define power factor ?...

Define 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)/(Z)=("Resistance")/("Impedance")`
iii. Power factor `=(VIcosphi)/(VI)=("True power")/("Apparent power")`
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