One wattmeter method is used to measure power in a three phase circuit when
A. the power factor is unity
B. the supply frequency is 50 Hz only
C. the load is balanced in all three phases
D. the supply voltage is 220 V.
Answer:C
One wattmeter method is used to measure power in a three phase circuit when
A. the power factor is unity B. the supply frequency is 50 Hz only C. the load is balanced in all three phases D. the supply voltage is 220 V.