Which one of the following is a disadvantage of a potentiometer over a voltmeter?
Correct answer: C. It is heavy and not portable
- A. It can measure the internal resistance of a cell
- B. It can measure the e.m.f. of a cell
- C. It is heavy and not portable
- D. It can measure accurately very small PD. of the ord of a few microvolts
Explanation
options A, B, and D would rather be the advantages or uses of potentiometers, hence considering all the options, option C would be the disadvantage of potentiometers as potentiometers are, in fact, "heavy and not portable" compared to voltmeters.
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