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  • A variable resistor in a circuit
    Rights: Image licenced through 123RF.com Published 2 September 2010 Size: 26 KB Referencing Hub media

    A variable resistor1 can be used if the current2 needs to be varied over a range of values, changing the operation or output of the circuit.

    1. resistor: An electrical component used to restrict the current in a circuit or part of a circuit. It uses up power and heats up.
    2. current: The flow of electric charge through a conductor.
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      resistor

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    2. An electrical component used to restrict the current in a circuit or part of a circuit. It uses up power and heats up.

      current

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    4. The flow of electric charge through a conductor.