when we have to use UPF wattmeter and LPF wattmeter? what is the difference bet

when we have to use UPF wattmeter and LPF wattmeter?
what is the difference between UPF and LPF wattmeter in
terms of construction?

Question Posted / arunraj

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when we have to use UPF wattmeter and LPF wattmeter? what is the difference between UPF and LPF wat..

Answer / dilshad

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 ?

35 Yes

2 No

when we have to use UPF wattmeter and LPF wattmeter? what is the difference between UPF and LPF wat..

Answer / sridhar

lpf is stands for lagging power factor and upf stands for unity power factor and lpf where used in pure inductive load oriented where as upf where used in pure resistive load oriented. This is the main difference usage in experiments.

Is This Answer Correct ?

6 Yes

2 No

when we have to use UPF wattmeter and LPF wattmeter? what is the difference between UPF and LPF wat..

Answer / k .balaji singh

As we know the difference between upf and lpf as for resistive loads we use upf as resistive loads are which rise in temperature while passing current in electrical and in mechanical the break drum is a resistive load so while coming to inductive load which we use lpf low power factor wattemeter as inductive loads as inductor which does not draw that much current comare to resistor.

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0 No

when we have to use UPF wattmeter and LPF wattmeter? what is the difference between UPF and LPF wat..

Answer / shoeb

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

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9 Yes

31 No

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