A voltmeter has a resistance of G ohms and range V volts. The value of resistance required in series to convert it into voltmeter of range nV is________________?
Correct answer: D. (n-1)G
- A. nG
- B. G/n
- C. G/(n-1)
- D. (n-1)G
Explanation
The original voltmeter has total resistance G for full-scale voltage V. To measure nV with the same current, the total resistance must become nG, so the series resistance is nG − G = (n − 1)G.
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