This paper will introduce the selection experience of several resistors. The resistance should be selected according to the specific requirements, performance, voltage and spectral characteristics of the circuit. There are many types of resistors, which can be distinguished according to different resistors. The change of resistance value related to them accounts for several thousandth of the original resistance value. It can be considered that the two processes proceed at approximately constant speed during the working period of the resistor. Resistors slow down with time in the crystallization process and internal stress removal process, but it is not possible to terminate during the use of the resistor. Generally, heat treatment can be used to eliminate the internal stress, and the residual internal stress may be gradually eliminated in the process of long-term use, and the resistance value of resistor may change accordingly. The smaller the wire diameter or the thinner the film, the more significant the stress effect. The crystallization rate increases with the increase of temperature. The amorphous structure in the conductive film tends to crystallize at a certain speed under working conditions or environmental conditions, that is to say, the internal structure of conductive materials tends to be densified, which often leads to the decrease of resistance value. According to thermodynamics, amorphous structures tend to crystallize. The conductive film of thin film resistor is usually obtained by vapor deposition method, and there exists amorphous structure to a certain extent. Resistor is one of the necessary things for every household.
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