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Question
when we have to use UPF wattmeter and LPF wattmeter?
what is the difference between UPF and LPF wattmeter in
terms of construction?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
UPF: Unity power factor. Used when circuit is resistive.
LPF: Low power factor. Used when circuit in inductive or capacitive (when pf in near to zero).
 
Is This Answer Correct ?    7 Yes 0 No
Dilshad
 
Answer
# 2
my dear friend . UPF stands for unity power factor and LPF means low power factor . we have UPF or near UPF when we are dealing with capacitance and WE have LPF when we are dealing with inductance because in the case of capacitans powerfactor lead and in the case of inductance powerfactor will lag ..... this is the difference b/w UPF & LPF 
Is This Answer Correct ?    6 Yes 19 No
Shoeb
 
 
 

 
 
 
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