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In the circuit shown, the pressure coils of two wattmeters are connected to:

In the circuit shown, the pressure coils of two wattmeters are connected to: Correct Answer B

  • Above circuit is used for power measurement using two wattmeter method.
  • Two wattmeter method is to measure the power in a 3 phase, three-wire star or delta connected balanced or unbalanced load.
  • In this current coils of the wattmeter are connected with any two lines, say R and Y and the potential coil of each wattmeter is joined on the same line, which is the third line i.e. B as shown in figure below.
  • The total instantaneous power absorbed by the three loads Z1, Z2, and Z3 is equal to the sum of the powers measured by the two wattmeters W1 and W2.

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