What is potentiometer?
Answer:
potentiometer is basically a long piece of uniform wire across which a standard cell is connected.
it allows to compare emf of any two sources.
also used to measure internal resistance of a cell.
it has the advantage that it draws no current from voltage source being measured. As such it is unaffected by the internal resistance of wire.
A variable (calibrated) resistor.
Electricity. a device for measuring electromotive force or potential difference by comparison with a known voltage.
http://www.st-andrews.ac.uk/~jcgl/scots_...
a potentiometer is a very simple variant resistor. This means it has the ability of changing its electrical resistance.
You might find potentiometers of various shapes and sizes but they all have one thing in common: They have some kind of screw thou which you can change their resistance.
You could also try the following link:
http://en.wikipedia.org/wiki/potentiomet...
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
The original potentiometer is a type of bridge circuit for measuring voltages by comparison between a small fraction of the voltage which could be precisely measured, then balancing the two circuits to get null current flow which could be precisely measured. The word itself derives from the phrase "voltage potential," and "potential" was used to refer to "strength." The original potentiometers are divided into four main classes: the constant resistance potentiometer, the constant current potentiometer, the micro volt potentiometer and the thermocouple potentiometer
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