Resistors are a basic electronic component in circuits, primarily used to control the flow of electrical current. Its main function is to create an obstacle to current flow, causing electrical energy to be converted into heat energy. The unit of resistance is ohms (Ω), and its value is closely related to the properties, size and shape of the material. According to different structures and functions, resistors can be divided into various types such as fixed resistors, variable resistors and special resistors.

In circuit design, resistors are widely used in various scenarios such as current limiting, voltage dividing, loading, and signal conditioning. By properly selecting the resistance and power rating of the resistor, circuit performance can be optimized and the stability and reliability of the device ensured. Understanding the basic principles and properties of resistors is crucial for electronic engineers and circuit designers.