Wattmeter cannot be designed on the principle of_________________?
Correct answer: C. moving iron instrument
- A. electrostatic instrument
- B. thermocouple instrument
- C. moving iron instrument
- D. electrodynamic instrument
Explanation
A moving-iron instrument produces torque mainly proportional to the square of current, so it cannot directly provide the current-voltage product required for watt measurement. Electrodynamic, electrostatic and thermal methods can be adapted for wattmeters.
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