The power of a n-phase circuit can be measured by using a minimum of_______________?
Correct answer: A. (n - 1) wattmeter elements
- A. (n - 1) wattmeter elements
- B. n wattmeter elements
- C. (n + 1) wattmeter elements
- D. 2n wattmeter elements
Explanation
For an n-phase circuit, the total power can be measured with n−1 wattmeters because the sum of the wattmeter readings gives total power. Thus, a three-phase circuit needs at least two wattmeters.
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