Chapter 3

Variable resistors, potentiometers and diodes

When a resistor, which can be constructed by any of the processes that have been dealt with in Chapter 2, is provided with a third contact that rubs on the resistive material and makes contact with it, then the amount of resistance between this third contact and either of the fixed contacts can be made variable since it will change when the position of the contact on the resistive surface is altered. This type of arrangement can be described as a rheostat, variable resistor, trimmer or potentiometer according to its prospective use. The common factor is that the position of the third contact is set mechanically, so distinguishing this type of resistance variation from the type that is found ...

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