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In an electrodynamometer wattmeter the fixed coil carries

  • A.no current at all
  • B.the load current
  • C.a current proportional to the voltage across the load being measured
  • D.the difference between the load current and the current in the moving coil

Answer: B

The fixed coil is the current coil, wound with few turns of thick wire and connected in series with the load. The moving coil is the pressure coil, of many turns of fine wire with a series resistance, and is connected across the load.

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