The resistance in the circuit of the moving coil of a dynamometer wattmeter should be_____________?
Correct answer: C. high
- A. almost zero
- B. low
- C. high
- D. none of the above
Explanation
The moving-coil or pressure-coil circuit of a dynamometer wattmeter must have high resistance so that its current is small and the instrument does not significantly load the measured circuit. Low resistance would cause excessive pressure-coil current and error.
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