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Insertion error in a current measurement arises because the ammeter

  • A.shunts the circuit with a finite resistance
  • B.responds to the frequency of the current measured
  • C.has a scale divided in unequal steps
  • D.adds resistance in series with the circuit

Answer: D

Correct answer: adds resistance in series with the circuit

An ammeter is inserted in the path of the current, so its own resistance is added to the circuit and reduces the very current it is measuring. The requirement is therefore the opposite of a voltmeter’s: an ammeter should have a resistance small compared with the circuit it is placed in.

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