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In the ammeter-voltmeter method of measuring resistance, the value obtained is

  • A.the ratio of the two readings
  • B.the product of the two readings divided by the resistance of the voltmeter itself
  • C.the difference of the two readings expressed in the units of the ammeter
  • D.the sum of the two readings after each has been corrected for its own scale error

Answer: A

Ohm's law is applied directly: the voltmeter reading divided by the ammeter reading gives the resistance. The method is quick and needs no special apparatus, but it is only as accurate as the two instruments together, so it is used where a few per cent will do.

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