the sensitivity of potentiometer depends on?

Answer 1

For wire wound potentiometers, it depends on the number of turns more turns - higher sensitivity.
For conductive rubber potentiometers, the sensitivity is very high

Answer 2

The original meaning of the term potentiometer, which is still in use, is an apparatus used to measure the potential (or voltage) in a circuit by tapping off a portion of a known voltage from a resistive slide wire and comparing it with the unknown voltage by means of a voltmeter or galvanometer.

The present popular usage of the term potentiometer (or 'pot' for short) describes an electronic component which has a user-adjustable resistance. Usually, this is a three-terminal resistor with a sliding contact in the center. If all three terminals are used, it can act as a variable voltage divider.

Potentiometer as measuring instrument
Schematic symbol for a potentiometer. The arrow represents the moving terminal, called the wiper.
Enlarge
Schematic symbol for a potentiometer. The arrow represents the moving terminal, called the wiper.

The original potentiometer is a type of bridge circuit for measuring voltages. 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 microvolt potentiometer and the thermocouple potentiometer

Answer 3

The original meaning of the term potentiometer, which is still in use, is an apparatus used to measure the potential (or voltage) in a circuit by tapping off a portion of a known voltage from a resistive slide wire and comparing it with the unknown voltage by means of a voltmeter or galvanometer.

The present popular usage of the term potentiometer (or 'pot' for short) describes an electronic component which has a user-adjustable resistance. Usually, this is a three-terminal resistor with a sliding contact in the center. If all three terminals are used, it can act as a variable voltage divider.

Potentiometer as measuring instrument
Schematic symbol for a potentiometer. The arrow represents the moving terminal, called the wiper.
Enlarge
Schematic symbol for a potentiometer. The arrow represents the moving terminal, called the wiper.

The original potentiometer is a type of bridge circuit for measuring voltages. 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 microvolt potentiometer and the thermocouple potentiometer.

[edit] Constant current potentiometer

This is used for measuring voltages below 1.5 volts. In this circuit, the unknown voltage is connected across a section of resistance wire the ends of which are connected to a standard electrochemical cell that provides a constant current through the wire, The unknown emf, in series with a galvanometer, is then connected across a variable-length section of the resistance wire using a sliding contact(s). The sliding contact is moved until no current flows into or out of the standard cell, as indicated by a galvanometer in series with the unknown emf. The voltage across the selected section of wire is then equal to the unknown voltage. All that remains is to calculate the unknown voltage from the current and the fraction of the length of the resistance wire that was connected to the unknown emf. The galvanometer does not need to be calibrated, as its only function is to read zero. When the galvanometer reads zero, no current is drawn from the unknown electromotive force and so the reading is independent of the source's internal resistance

[edit] Constant resistance potentiometer

The constant resistance potentiometer is a variation of the basic idea in which a variable current is fed through a fixed resistor. These are used primarily for measurements in the millivolt and microvolt range.

[edit] Microvolt potentiometer

This is a form of the constant resistance potentiometer described above but designed to minimise the effects of contact resistance and thermal emf. This equipment is satisfactorily used down to readings of 10 nV or so.

[edit] Thermocouple potentiometer

Another development of the standard types was the 'thermocouple potentiometer' especially modified for performing temperature measurements with thermocouples. [1]

[edit] Potentiometer as electronic component
Image:Reochord.jpg
Construction of a wire-wound circular potentiometer. The resistive element (1) of the shown device is trapezoidal, giving a non-linear relationship between resistance and turn angle. The wiper (3) rotates with the axis (4), providing the changeable resistance between the wiper contact (6) and the fixed contacts (5) and (9). The vertical position of the axis is fixed in the body (2) with the ring (7) (below) and the bolt (8) (above).

In modern usage, a potentiometer is a potential divider, a three terminal resistor where the position of the sliding connection is user adjustable via a knob or slider. Potentiometers are sometimes provided with one or more switches mounted on the same shaft. For instance, when attached to a volume control, the knob can also function as an on/off switch at the lowest volume.

Ordinary potentiometers are rarely used to control anything of significant power (even lighting) directly due to resistive losses, but they are frequently used to adjust the level of analog signals (e.g. volume controls on audio equipment) and as control inputs for electronic circuits (e.g. a typical domestic light dimmer uses a potentiometer to set the point in the cycle at which the triac turns on). Potentiometers used to control high power are normally called rheostats.

Answer 4

Length of wire used and potential gradient.

Answer 5

length of the wire

Answer 6

it depends on the resistance...