about the effect of superconductivity know, probably all.In any case, we have heard of it.The essence of this effect is that at minus 273 ° C, the resistance of the conductor current flow is lost.Already one of this example is enough to understand that there is its dependence on temperature.And this dependence describes the special parameter - temperature coefficient of resistance.
any conductor prevents the current flowing through it.This opposition to each conductive mother's different, it is determined by many factors inherent in a particular material, but will not be discussed further on this.Interest at the moment is its dependence on the temperature and the nature of this relationship.
electric conductors are usually the metals from them with increasing temperature the resistance increases with decreasing it decreases.The magnitude of the change attributable to 1 ° C, and is called the temperature coefficient of resistance, or abbreviated TKS.
value of TCS can be positive or negative.If it is positive, the temperature increase of the conductor resistance increases, if negative, then decreases.For the majority of metals used as conductors of electrical current, the positive TCR.One of the best is copper conductors, temperature coefficient of resistance of copper not exactly the best, but compared to other conductors, it is smaller.You just have to remember that the value of TCS determines how when you change the parameters of the environment will be the value of resistance.His change is more significant than this ratio more.
Such a temperature dependence of the resistance must be taken into account in the design of electronic equipment.The fact that the apparatus should be operated at any ambient conditions, the same automobiles are operated from -40 ° C to + 80 ° C.A lot of electronics in the car, and if you do not take into account the impact of the environment on the work of the circuit elements, you might encounter a situation where the electronic control unit works well under normal conditions, but refuses to work under the influence of low or high temperatures.
It is this dependence on the environmental conditions and take into account the hardware developers in its design, using the parameters of the scheme when paying temperature coefficient of resistance.There are tables with data TKS for the materials used and the formula calculations for which the knowledge of TCS, we can determine the value of resistance in all conditions and operating modes into account in the scheme can be changes.But to understand what the TCS is now no formula, no tables are not needed.
It should be noted that there are metals with a very small value of TCS, and they are used in the manufacture of resistors, the parameters of which from changes in the environment depends weakly.
Temperature coefficient of resistance can be used not only to take into account the effect of fluctuations of environmental parameters, but also to measure the temperature.What is sufficient to measure the resistance.Knowing the material that has been exposed, according to the tables you can determine which temperature corresponds to the measured resistance.As this meter can be used ordinary copper wire, however, have to use it a lot and as a wound, such as a coil.
All the above does not cover all the issues fully use the temperature coefficient of resistance.There is a very interesting application possibilities associated with this factor in semiconductors, electrolytes, but also what is contained, enough to understand the concept of TCS.
