Thermistor - Basic Operation

Basic Operation

Assuming, as a first-order approximation, that the relationship between resistance and temperature is linear, then:

where

= change in resistance
= change in temperature
= first-order temperature coefficient of resistance

Thermistors can be classified into two types, depending on the sign of . If is positive, the resistance increases with increasing temperature, and the device is called a positive temperature coefficient (PTC) thermistor, or posistor. If is negative, the resistance decreases with increasing temperature, and the device is called a negative temperature coefficient (NTC) thermistor. Resistors that are not thermistors are designed to have a as close to zero as possible, so that their resistance remains nearly constant over a wide temperature range.

Instead of the temperature coefficient k, sometimes the temperature coefficient of resistance (alpha sub T) is used. It is defined as

This coefficient should not be confused with the parameter below.

Read more about this topic:  Thermistor

Other articles related to "basic operation, basic, operation":

Automatic Block Signaling - Basic Operation - Automatic Traffic Control
... These types of systems were also very popular Interurban streetcar lines due to the high capacity and low cost. ...
Metal Detector - Uses - Basic Operation
... The basic principle of operation for the common industrial metal detector is based on a 3 coil design ...

Famous quotes containing the words operation and/or basic:

    Human knowledge and human power meet in one; for where the cause is not known the effect cannot be produced. Nature to be commanded must be obeyed; and that which in contemplation is as the cause is in operation as the rule.
    Francis Bacon (1560–1626)

    The gay world that flourished in the half-century between 1890 and the beginning of the Second World War, a highly visible, remarkably complex, and continually changing gay male world, took shape in New York City.... It is not supposed to have existed.
    George Chauncey, U.S. educator, author. Gay New York: Gender, Urban Culture, and the Making of the Gay Male World, 1890-1940, p. 1, Basic Books (1994)