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A moving iron instrument reads

  • A.the root mean square value of the quantity
  • B.the average value of the quantity over a cycle
  • C.the peak value of the quantity in each cycle
  • D.the form factor of the applied waveform

Answer: A

Because the torque follows the square of the instantaneous current, the mean torque follows the mean square and the scale can be marked in root mean square units. It therefore reads correctly on any waveform, which a rectifier instrument does not.

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