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Why does rheostat have 3 terminals?

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Why does rheostat have 3 terminals?

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A 3 terminal pot used with 3 terminals, is basically just a voltage divider. As you move the wiper, you increase one resistor in the voltage divider, while decreasing the resistance in the other. ... Connecting a wiper to one leg of the pot, is a rheostat. A rheostat is a variable resistor.Mar 6, 2015

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