Jockey is a metal strip with insulated handle that used to slide over the long wire which is used as varible resistor.

  • Resistance of a wire is directly proportional to it's length.
  • So by sliding jockey through the wire, the wire between one terminal and the jockey is under consideration and that fraction of the length correspond to a fraction of total resistance.
  • Long wire as a variable resistance gives precise and small values of resistance.

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