The rheostat (or variable resistor)

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Presentation transcript:

The rheostat (or variable resistor) © D Hoult 2010

minimum resistance

maximum resistance

Using a rheostat as a “voltage divider”

A rheostat can be used to provide a variable voltage supply

A rheostat can be used to provide a variable voltage supply

A rheostat can be used to provide a variable voltage supply

A rheostat can be used to provide a variable voltage supply

Adjust the voltage to 3V

Now connect a light bulb in parallel with the voltmeter

Now connect a light bulb in parallel with the voltmeter

Now connect a light bulb in parallel with the voltmeter This shows that the variable potential divider is not a stable voltage source