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Two watt-meters, which are connected to measure the total power on a three-phase system supplying a balanced load, read 20.5 kW and -3.5 kW respectively. The total power is?

Two watt-meters, which are connected to measure the total power on a three-phase system supplying a balanced load, read 20.5 kW and -3.5 kW respectively. The total power is? Correct Answer 19 kW

w1 = 20.5 kW, w2 = -3.5 kW ∴ w = w1 + w2 = 20.5 – 3.5 = 17 kW.

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