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The power factor of a single phase load can be calculated if the instruments available are_____________?

/ Measurement and Instrumentation / By
The power factor of a single phase load can be calculated if the instruments available are_____________?

A. one voltmeter and one ammeter
B. one voltmeter, one ammeter and one wattmeter
C. one voltmeter, one ammeter and one energy meter
D. any of the above