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| Potentiometer as a voltage divider schematic diagram |
Begin this experiment with the pencil ”lead” circuit. Pencils use a rod made of a graphiteclay mixture, not lead (the metal), to make black marks on paper. Graphite, being a mediocre electrical conductor, acts as a resistor connected across the battery by the two alligator-clip jumper wires. Connect the voltmeter as shown and touch the red test probe to the graphite rod. Move the red probe along the length of the rod and notice the voltmeter’s indication change. What probe position gives the greatest voltage indication?
Essentially, the rod acts as a pair of resistors, the ratio between the two resistances established by the position of the red test probe along the rod’s length:
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| Potentiometer as a voltage divider illustration |
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| Potentiometer as a voltage divider illustration 01 |
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| Potentiometer as a voltage divider illustration 02 |
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