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Measurements & InstrumentationRange Extension

A meter movement has full-scale current 1 mA and internal resistance 100 ohm. What series resistance is required for a 10 V voltmeter range?

  • A900 ohm
  • B9.9 kohm
  • C10 kohm
  • D100 kohm
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Correct Answer: B. 9.9 kohm
Explanation: Total resistance required is V/I=10/0.001=10 kohm. Subtracting the 100 ohm movement resistance gives 9.9 kohm.
Reference: Standard measurements and instrumentation: range extension
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