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Of the two ammeter-voltmeter connections, the one with the voltmeter across the unknown alone is preferred when the unknown resistance is

  • A.high
  • B.of the same order as the resistance of the voltmeter that is being employed
  • C.known approximately beforehand from the nameplate data of the equipment
  • D.low

Answer: D

For a low unknown the voltmeter current is a small fraction of the total, so that connection errs little; the ammeter resistance, on the other hand, would be a large fraction of a low unknown and would spoil the other connection. The choice is reversed for a high unknown.

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