What is the resistance of a thermistor at a temperature of 0 degrees Celsius? This is an interesting question. In general, its resistance increases or decreases as the temperature increases, but usually, this is not the real cause.
1: The working principle of thermistor
A thermistor is a semiconductor material that can detect temperature. When an object is subjected to external energy, it changes, so it can be used to measure temperature. Thermistor and allchips have many advantages: 1. High sensitivity; 2. 2. Fast response speed; 3, good stability; 4. High reliability. The disadvantage is that it is more expensive. It is widely used in industrial production, such as electronic components factory, chemical plant and so on. When the external environment changes, thermistor also needs to make corresponding adjustments to adapt to the change. If the environment is unstable or cannot meet the demand, the thermistor will be replaced. So what exactly is a thermistor? In fact, thermistor is a device that uses the semiconductor to absorb light to different degrees to detect and sense temperature.
2: The influence of temperature on thermistor resistance value
The influence of temperature on thermistor resistance value is mainly manifested in two aspects: first, due to the different ambient temperature, the current distribution in thermistor will be different; The second is that when the user is exposed to high temperatures, the heat is transmitted to the surrounding environment, resulting in additional electromagnetic interference. When the ambient temperature is lower than 0 degrees Celsius, the resistance of the thermistor to the outside world becomes smaller. At this time, the actual resistance of the thermistor is reduced more, but the effective conductive area of the thermistor is greatly increased, so that its immunity is greatly improved. When the ambient temperature reaches or exceeds 100 degrees Celsius, the thermistor begins to become unstable. At this time, the maximum impedance of the thermistor changes, making it more sensitive to the ambient temperature.
3: resistance in different occasions
Resistors are used differently in different situations, so thermistor resistance values will vary. In general, the resistance at 0 degrees Celsius is 1 watt; At 150°C, the resistance is equal to about 10 millivolts. However, if you want to use in high temperature environment, you need to choose a larger model. The influence of temperature on thermistor resistance value is mainly caused by two factors: one is the characteristics of the material itself, and the other is the change of electromagnetic field intensity caused by temperature change. The characteristics of the material itself cause the resistance value to change with temperature. This is due to the effect of the surface resistivity and capacitance of the conductor and the existence of the interface state of the superconductor and metal/insulator at high temperature, which leads to the decrease of the conductivity. The change of electromagnetic field intensity caused by temperature change means that when the magnetic field around the object changes, the amplitude of the induced voltage signal generated by the force is different, which leads to the change of the circuit output signal, so that the actual working current of the measured part is affected, and then the final measurement result is affected.
So if you want to know if it changes at all under certain conditions, it's best to test it experimentally. However, it is important to note that this test should only be used in a laboratory and should follow certain safety rules.