A balanced three-phase star-connected load draws power from a 440 V supply. The two connected wattmeters, W1 and W2, indicate 5 kW and 1200 W. Calculate the total power.
When two wattmeters are used to measure the power in a balanced three-phase system, the total power is given by:
Total power = W1 + W2
where W1 is the reading of one wattmeter and W2 is the reading of the other.
In this case, W1 = 5 kW and W2 = 1200 W. Therefore,
Total power = 5 kW + 1200 W
We need to convert the power to the same units before adding them up. Let's convert W2 to kilowatts:
W2 = 1200 W = 1.2 kW
Total power = 5 kW + 1.2 kW = 6.2 kW
Therefore, the total power is 6.2 kW. Answer: 6.2 kW.