Adjustable resistance is also called variable resistance. Its English is Rheostat. Adjustable resistance is a type of resistance. The resistance value of adjustable resistance can be adjusted artificially to meet the needs of the circuit.

Adjustable resistors can be divided into many different models and types according to the size of the resistance value, the range of adjustment, the form of adjustment, the production process, the production material, the size, etc., which can be divided into: adjustable resistance of electronic components, adjustable porcelain plate Resistors, patch adjustable resistors, wire wound adjustable resistors and so on.

The nominal value of the adjustable resistor is the standard that can be adjusted to the maximum resistance value. In theory, the resistance of the adjustable resistor can be adjusted to any value within 0 and the nominal value, but because of the actual structure and design accuracy requirements, etc. The reason is that it is often not easy to meet the "arbitrary" requirements 100%, but "basically" adjust within the allowable range to change the resistance.

Fundamental

Common adjustable resistors are mainly used to change the resistance value by changing the length of the resistance access circuit. For temperature-sensitive resistors, the resistance value can also be changed by changing the temperature. This is called thermistor; Sensitive resistors achieve the purpose of changing the resistance value by changing the intensity of light. This is called a photoresistor; in addition, there are varistors, gas-sensitive resistors and so on.

Device role

It can gradually change the current in the electrical appliances connected in series with it, and can also gradually change the voltage of the electrical appliances connected in series with it, and it can also play a role in protecting the electrical appliances. In the experiment, it also plays a role in obtaining multiple sets of values.

Due to the structure and use of variable resistors, the failure rate is significantly higher than that of ordinary resistors. Variable resistors are usually used in small-signal circuits, and large-signal variable resistors are also used in a few occasions such as tube amplifiers.