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What is another common name for a variable resistor? In the diagram of a potentiometer shown in Fig. 1, does the resistance between terminals 1 and 3 vary? What is the typical substance used to make the resistive component in standard potentiometers? Page 25

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Keith

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Answer

1. Potentiometer or rheostat2. No3. Carbon

Explanation

1. A variable resistor is also known as a potentiometer or a rheostat. It is a type of resistor whose resistance can be adjusted.2. In the diagram of a potentiometer, the resistance between points 1 and 3 does not vary. This is because the potentiometer is designed with a fixed resistor and a sliding contact that moves along a linear path. The resistance between points 1 and 3 is determined by the fixed resistor and does not change with the position of the sliding contact.3. The substance used to make the resistive component in standard potentiometers is typically a carbon resistor. Carbon resistors are made by depositing a thin layer of carbon onto a ceramic base. The resistance of the carbon resistor is determined by the thickness and composition of the carbon layer.

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