Analysis of the reasons for the decrease in resistance value

Introduction: Resistors are common electronic components in our daily lives, and their main function is to obstruct the flow of current. However, sometimes we may find that the resistance value of the resistor has changed. So, what are the reasons for the decrease in resistance value? This article will elaborate on the following aspects

1、 Temperature influence

The resistance value of a resistor is closely related to temperature. As the temperature increases, the atomic and molecular motion of the resistor material accelerates, causing electrons to move more vigorously in the conductor, resulting in a decrease in resistance. On the contrary, as the temperature decreases, the resistance increases. Therefore, one of the reasons for the decrease in resistance may be the change in temperature

2、 Material properties

The resistance value of a resistor is related to its material, and different materials have different resistivity and resistance values. If the material used for the resistor is modified or aged, it may cause a change in the resistance value of the resistor. In addition, the resistance value of the resistor may also be affected by factors such as impurities and humidity

3、 External environmental factors

External environmental factors may also cause changes in resistance values. For example, when the humidity in the environment where the resistor is located increases, moisture will penetrate into the resistor material, resulting in a decrease in the resistance value; When corrosive gases or chemicals are present in the surrounding environment, they may cause damage to the resistance material, leading to an increase in resistance value

4、 Circuit structure

In a circuit, the position and connection method of a resistor can also affect its resistance value. For example, when a resistor is connected in parallel with other components, the total resistance value will decrease; When a resistor is connected to a power supply, due to the internal resistance of the power supply, the actual current passing through the resistor increases, resulting in a decrease in the resistance value of the resistor

5、 Measurement error

The change in resistance value may also be affected by measurement errors. For example, using inappropriate measuring instruments or improper measurement methods can lead to measurement results that deviate, causing us to mistakenly believe that the resistance value of the resistor has changed

There are many reasons for the decrease in resistance value, including temperature effects, material properties, external environmental factors, circuit structure, and measurement errors. When using resistors, we need to choose appropriate materials and measurement methods based on specific situations to ensure the accuracy of measurement results