To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken_______________?
Correct answer: C. from the same source as the unknown voltage
- A. from a source which is not the same as the unknown voltage
- B. from a battery
- C. from the same source as the unknown voltage
- D. any of the above
Explanation
The AC potentiometer supply should be taken from the same source as the unknown voltage so that both have the same frequency and a stable phase relationship. An unrelated source could introduce phase or frequency errors.
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