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== rheostat and potentiometer == rheostat: A continuously variable electrical resistor used to regulate current. potentionmeter: An instrument for measuring an unknown voltage by comparison to a standard voltage. A potentiometer is a three terminal device. A rheostat is a two terminal device. A potentiometer is hooked as a variable voltage divider. The resistance across the outer terminals is constant. It changes the potential, the voltage. A rheostat is hooked as a variable resistance. It varies the current. A potentiometer can be connected as a rheostat by leaving one of the terminals unconnected.

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