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    Electronics - Variable Resistor mleahy

    Saw on exam paper the following question and would like to know the answer, why does a variable resistor have 3 pin?

    Does anyone know?

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      You can use two of the three leads, but if you need a variable voltage divider then 3 is necessary.

      The other advantage of 3 pins is you can select clockwise or counterclockwise to increase or decrease the resistance.

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