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The number of digits and the accuracy of a digital voltmeter are related in that a well designed instrument has

  • A.accuracy finer than its resolution
  • B.no relation between the two
  • C.resolution somewhat finer than its accuracy
  • D.resolution exactly equal to its accuracy at full scale

Answer: C

There is little point resolving a microvolt on an instrument accurate only to a millivolt, and equally little point in an accuracy the display cannot show. Makers generally provide a resolution a few times finer than the accuracy, so the last digit is informative though not guaranteed.

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