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With the voltmeter connected across both the unknown resistance and the ammeter, the value obtained is too high by

  • A.the resistance of the leads joining the instruments to the specimen under test
  • B.an amount that cannot be predicted and must be found by a separate calibration
  • C.the resistance of the ammeter
  • D.the resistance of the voltmeter multiplied by the ratio of the two readings

Answer: C

The voltmeter now reads the drop across the series combination, so the ratio gives the unknown plus the ammeter resistance. The error is therefore a known constant and can be subtracted. This connection suits a high unknown, where the ammeter resistance is negligible against it.

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