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A thermocouple instrument measures current by

  • A.the force between two current-carrying coils
  • B.the electrostatic force between two charged plates
  • C.heating a wire and measuring the thermocouple emf produced
  • D.rectifying the current and averaging the result

Answer: C

Heating follows the square of the current, so the instrument reads true rms whatever the waveform, and it works to very high frequencies because the heater is a simple resistance. Its overload capability is very small.

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