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electronics and communication engineering measurements and instrumentation
1. In two wattmeter method of 3 phase power measurement, when does one wattmeter read negative
(A): when power factor is greater than 0.5 lagging
(B): when power factor is less than 0.5
(C): when power factor is less than 0.5 lagging
(D): when power factor is unity
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By: guest on 02 Jun 2017 01.00 am
When p.f. is less than 0.5 (leading or lagging) one of the wattmeters reads negative.
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