For the case shown, the resistance of slide wire is 10 Ω and the dial resistors have a value of 10 Ω each. The circuit of a simple laboratory type potentiometer is shown in the below figure.There is one dial switch with fifteen steps, each having a precision resistor.There is also a single turn circular slide wire. Modern laboratory type potentiometers use calibrated dial resistors and a small circular wire of one or more turns, thereby reducing the size of the instrument. The long slide wire is awkward, and even for the length shown cannot be read to a very great degree of precision. ![]() ![]() The slide-wire type of potentiometer described in the previous article is not a practical form of construction.
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