Resistors are fundamental components in electronic circuits, used to limit current flow, divide voltages, and adjust signal levels. They come in various types, including fixed resistors (carbon film, metal film, wirewound) and variable resistors (potentiometers, rheostats). Key specifications include resistance value (ohms), power rating (watts), and tolerance. Common applications include circuit protection, voltage regulation, and sensor calibration. Examples of products in this category: chip resistors, through-hole resistors, high-power resistors, and precision resistors. Resistors are essential for automation systems, signal conditioning, and industrial control electronics.