There are two main differences between load resistance and resistance:
Difference 1: Load resistance is a concept in college teaching, and resistance is a concept in high school teaching, so load resistance is only a classification of resistance.
Difference 2: The reference parts are different, and the load resistance refers to the circuit, electrical terminal components or parts. The resistance can be anywhere in the circuit and electricity.
In the process of making load resistor, the theme should consider the non-inductive performance and heat dissipation performance of the product. Non-inductive performance As mentioned above, heat dissipation performance is due to discharge. Absorbing power will cause the resistor itself to generate a lot of heat, so the temperature will rise rapidly.
Therefore, in order to ensure the good heat dissipation performance of the product, it is best to use heat-resistant materials and metal materials for the shell, so that the heat can quickly flow to the outside through products such as heat sinks. At the same time, the process requirements are also very strict.
Extended data
Controlling factors of resistance:
Although the resistance is defined as: 1 volt generates an ampere current, it is 1 ohm resistance; But voltage and current are not the factors that determine resistance.
The resistance value of resistance elements is generally related to temperature, conductor length, cross-sectional area and material. The resistance of most (metals) increases with the increase of temperature, but some semiconductors, such as glass and carbon, are the opposite.
At a certain temperature, there is a formula R=ρl/s, where ρ is the resistivity, L is the length of the material in m, and S is the area in square meters. It can be seen that the resistance of a material is directly proportional to its length and inversely proportional to its area. For non-uniform conductors, the resistivity may also be different everywhere inside.
References:
Baidu encyclopedia-load resistance
Baidu encyclopedia-resistance