Unit Power Factor is used to measure the high current, but Low Power Factor is used to measure the low current.
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The UPF wattmeter is used to measure the power with better power factor. the LPF wattmeter is used to measure the power with lower power factor(<0.5).
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sharath
Answered On : Oct 28th, 2011
LPF watt meter is used for measuring power in highly inductive circuits & UPF watt meter is used for measure power in resistance circuit in which the power factor ranges from 0.5 to unity.

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