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With the pressure coil connected on the load side of the current coil, the wattmeter reads the power in the load plus

  • A.nothing at all
  • B.the loss in both coils
  • C.the loss in the current coil
  • D.the loss in the pressure coil circuit

Answer: C

The current coil then carries the load current only, and the pressure coil measures the voltage across the load plus the drop in the current coil, so the current coil loss is included. This connection suits a heavy load current at low voltage.

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