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Topic:Kt Kingtronics Potentiometer Theory of Operation
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A potentiometer with a resistive load, showing equivalent fixed resistors for clarity.The potentiometer can be used as a voltage divider to obtain a manually adjustable output voltage at the slider (wiper) from a fixed input voltage applied across the two ends of the potentiometer. This is the most common use of them. The voltage across RL can be calculated by:If RL is large compared to the other resistances (like the input to an operational amplifier), the output voltage can be approximated by the simpler equation:As an example, assume, , , and Since the load resistance is large compared to the other resistances, the output voltage VL will be approximately:Due to the load resistance, however, it will actually be slightly lower: ≈ 6.623 V.One of the advantages of the potential divider compared to a variable resistor in series with the source is that, while variable resistors have a maximum resistance where some current will always flow, dividers are able to vary the output v
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