There are many methods for classifying resistors, mainly based on whether the resistance value changes, the materials used, and their functions. 1) According to whether the resistance value changes, it can be divided into fixed resistors, variable resistors, and sensitive resistors. 2) According to the materials used to make resistors, they can be divided into carbon film resistors, metal oxide film resistors, metal glass glazed resistors, inorganic solid resistors, organic solid resistors, chemical deposition film resistors, synthetic carbon film resistors, and wire wound resistors. 3) According to their usage, they can be divided into general purpose resistors, high resistance resistors, high-voltage resistors, high-frequency resistors, and precision resistors. 4) According to its structure, it can be divided into cylindrical resistors, tubular resistors, disc resistors, chip resistors, button resistors, and row resistors. 5) According to the form of leads, they can be divided into axial lead type resistors, co directional lead type resistors, non lead type resistors, tie type lead type resistors, and radial lead type resistors. 6) According to the fusing characteristics, it can be divided into disposable fusing resistors and recoverable fusing resistors. 7) For sensitive resistors, they can be divided into thermistors, photosensitive resistors, varistors, magnetic resistors, temperature sensitive resistors, gas sensitive resistors, and force sensitive resistors. 8) For variable resistors, they can be divided into potentiometers and semi variable resistors (trimming resistors)
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