The hot resistance and cold resistance of the Jieda thick film electric heating tube are referred to the resistance value under different working conditions. There are certain differences between them, mainly depending on the temperature change and resistance characteristics of the heating tube.
Hot resistance refers to the resistance value of the heating tube in the working state, that is, the resistance value when the heat generated by the heating tube increases its own temperature during the heating process. When the current passes through the heating tube, due to the presence of resistance, the electrical energy is converted into heat energy, resulting in an increase in the temperature of the heating tube. In the hot state, the resistance value of the heating tube will increase with the increase of temperature. This is because the resistivity of the material usually increases with the temperature, that is, the hot resistance value is greater than the cold resistance value.
Cold resistance refers to the resistance value of the heating tube in the initial state, that is, the resistance value when the heating tube is not heated or the temperature is low. When the heating tube is in a cold state, its temperature is low and the resistance value is relatively small. Cold resistance is usually the resistance value measured at room temperature, so it is also called room temperature resistance.
The key to distinguish between hot resistance and cold resistance is the working state and temperature of the heating tube. When the heating tube reaches a stable state after heating, its resistance value is called a hot resistance, and conversely, the resistance value when it is not heated or the temperature is low is called a cold resistance.
It should be noted that the hot resistance and cold resistance are the resistance values of the heating tube under the specific working state, rather than the inherent resistance of the heating tube material itself. They reflect the resistance changes of heating tubes at different temperatures, and are of great significance for the design and control of heating systems.