Resistance is one of the most widely used and commonly used electronic components in electronic circuits, which is usually referred to as resistance for short. Resistors are electronic components that control the current in a circuit. By controlling the current, the following purposes can be achieved: (1) Establish a suitable current operating point for the amplifier circuit; Establishing an appropriate voltage operating point for the amplifier circuit through voltage division; As a load resistor, an amplified signal is obtained from the amplifier circuit; Cooperating with the capacitor to obtain delay and timing control signals; It cooperates with the capacitor to form a differential or integral circuit to shape and transform the signal; And is matched with a capacitor to form a power filter circuit. Resistance can be divided into fixed resistance and variable resistance (or adjustable resistance) according to structure. Fixed resistance is a kind of resistance with fixed resistance, which can be divided into carbon film resistance, metal film resistance and wire wound resistance according to its composition materials. A variable resistor is a resistor whose resistance can be changed. According to its composition and structure, it can be divided into sliding adjustable resistor and potentiometer. In addition, there are some resistors with special functions and special uses, such as thermistors for detecting temperature and photoresistors for detecting illumination. These resistors can be called sensitive resistors and are not usually regarded as resistive elements.

I hope I can solve your problem.