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Variable Potential Divider Circuit

We can make a variable potential divider using a rheostat (also called a variable resistor). In this case we have a circuit similar to the previous one but now the two resistors R1 and R2 are two parts of the same component. This is useful for volume controls etc.

The diagram on the right shows the approximate appearance of the variable resistor on its support.

Connect a voltmeter as shown and move s (that is, turn the rheostat).

Note that the voltmeter reading varies from zero to the full voltage of the battery.

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