?The white ones are cement resistors, which are made by winding the resistance wire around non-alkali heat-resistant porcelain and protected by heat-resistant, moisture-resistant and corrosion-resistant materials. Fix and place the wire-wound resistor body into a square porcelain frame, and fill and seal it with special non-combustible heat-resistant cement. The outside of the cement resistor is mainly made of ceramic material. Cement resistors have the characteristics of large size, shock resistance, moisture resistance, heat resistance, good heat dissipation, and low price. They are widely used in power adapters, audio equipment, audio frequency dividers, instruments, meters, televisions, automobiles and other equipment.
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The blue one is the metal film resistor. It uses high-temperature vacuum coating technology to tightly attach nickel-chromium or similar alloy to the surface of the porcelain rod to form a film. After cutting and debugging, the resistor is value to achieve the final required precision resistance value, and then add appropriate joints and cut them, and coat the surface with epoxy resin for sealing protection. Because it is a lead-type resistor, it is convenient for manual installation and maintenance, and is used in most home appliances, communications, and instruments. It is the most widely used resistor so far, with high precision, stable performance, simple and lightweight structure. It plays a role that cannot be ignored in the electronics industry and military aerospace and other fields with high precision requirements. The manufacturing process of metal film resistors is relatively flexible. Not only can its material composition and film thickness be adjusted, but the resistance value can also be adjusted by notching grooves. Therefore, resistors with good performance and a wide resistance range can be made. Metal film resistors are one type of film resistors (Film Resistors). The metal film resistor uses nickel-chromium or similar alloy vacuum plating technology to deposit the film on the surface of the white porcelain rod. After cutting and adjusting the resistance value, it can achieve the final required precision resistance value.