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Answer Posted / ariel
It is the ratio of true power(watts) and apparent power(VA).
PF=watts/va= cos teta
unity pf - the voltage and current are in phase
lagging pg - the current lags the voltage by an acute angle
teta
leading pf - the current leads the volatage by an acute
angle teta
zero pf - if the voltage and current are out of phase by
exactly 90 deg.
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