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The rheostat (or variable resistor)

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Presentation on theme: "The rheostat (or variable resistor)"— Presentation transcript:

1 The rheostat (or variable resistor)
© D Hoult 2010

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9 minimum resistance

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13 maximum resistance

14 Using a rheostat as a “voltage divider”

15 A rheostat can be used to provide a variable voltage supply

16 A rheostat can be used to provide a variable voltage supply

17 A rheostat can be used to provide a variable voltage supply

18 A rheostat can be used to provide a variable voltage supply

19 Adjust the voltage to 3V

20 Now connect a light bulb in parallel with the voltmeter

21 Now connect a light bulb in parallel with the voltmeter

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

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