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.

Question

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.

RRB Paper · Accepted Answer

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.

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.

5 kW

6

200 kW

62 kW

6

200 W

The correct answer is `No. 4: 62 kW`

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