What is the difference between a potentiometer and an adjustable resistor2021

A potentiometer is a resistance element whose resistance can be adjusted according to a certain change rule. In fact, a potentiometer is also called an adjustable resistor or a variable resistor in foreign countries, but in China, an adjustable resistor and a potentiometer are not an electronic component. There are differences between them, and I will explain them in the specific text.

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In terms of structure and working principle of adjustable resistors, potentiometers and adjustable resistors are basically similar, but not all the same, so they also have similarities and differences. What is the difference between potentiometers and adjustable resistors? Mainly from the following points to view:

1. Handle: The potentiometer has a handle, but the adjustable resistor has no handle.

2. Resistance distribution characteristics: The output characteristics of the potentiometer have a variety of functional characteristics, and the distribution characteristics of the resistors of different potentiometers are different; and the distribution characteristics of the resistors of the adjustable resistor are the same.

3. Number of connections: Potentiometers have double potentiometers, but adjustable resistors do not.

4. Volume: The potentiometer has a large volume, a firm structure and a long service life. The adjustable resistor has a small size and a shorter service life.

5. Anti-interference performance: The metal shell of the potentiometer is grounded in the circuit (the handle is connected to the shell), so that the interference is relatively small when the potentiometer is adjusted, and the purpose of suppressing interference can be achieved; and the adjustable resistance has no grounding pin, which will be adjusted when adjusting the potentiometer. Interference by human body induction.

6. Installation location and frequency of use: The potentiometer is installed on the circuit board or on the case. No matter which installation method is used, its handle needs to be extended out of the case. For easy adjustment, the machine often adjusts the potential during use. The adjustable resistor is installed on the circuit board, and it is usually not adjusted during use, and the resistance value is only adjusted during troubleshooting.

7. Service life: The potentiometer has a firm structure and a long service life. However, due to the frequent use of the potentiometer and its mechanical movement, the potentiometer will often be damaged before the adjustable resistor in the same machine; the adjustable resistor has a simple structure, improper adjustment is easy to damage, and its life is short, but because The frequency of use is low, so there is no shortcoming of short service life.