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The resolution of a wire-wound potentiometric transducer is limited by

  • A.the spacing of the individual turns of the winding
  • B.the resistance of the wiper contact against the track
  • C.the supply voltage applied across the whole element
  • D.the temperature coefficient of the resistance wire used

Answer: A

The wiper moves from one turn to the next, so the output changes in steps of one turn's worth of resistance rather than continuously. A conductive plastic track has no such limit, which is why it is preferred where fine resolution matters.

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