1) "Rheostat" -- As to rheostat
rheo·stat
Pronunciation: 'rE-&-"stat
Function: noun
: a resistor for regulating a current by means of variable resistances
- rheo·stat·ic /"rE-&-'sta-tik/ adjective
Pronunciation Symbols

A potentiometer is a variable resistor that can be used as a voltage divider.

Originally a potentiometer was an instrument to measure the potential (or voltage) in a circuit by tapping off a fraction of a known voltage from a resistive slide wire and comparing it with the unknown voltage by means of a galvanometer.

The present popular usage of the term potentiometer (or 'pot' for short) describes an electrical device which has a user-adjustable resistance. Usually, this is a three-terminal resistor with a sliding contact in the center (the wiper). If all three terminals are used, it can act as a variable voltage divider. If only two terminals are used (one side and the wiper), it acts as a variable resistor. Its shortcoming is that of corrosion or wearing of the sliding contact, especially if it is kept in one position.

1 Potentiometer as measuring instrument

1.1 Constant current potentiometer

1.2 Constant resistance potentiometer

1.3 Microvolt potentiometer

1.4 Thermocouple potentiometer

2 Potentiometer as electronic component

2.1 Types of potentiometers

2.1.1 Low-power types

2.1.1.1 Linear potentiometers

2.1.1.2 Logarithmic potentiometers

2.1.2 High-power types

2.1.3 Digital control

2.2 Applications of potentiometers

2.2.1 Transducers

2.2.2 Audio control

3 Theory of operation

4 Early patents

5 See also

6 External links

Schematic symbol for a potentiometer. The arrow represents the moving terminal, called the wiper.
The origina..."

Further Data On Term for rheostat
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