Resistance is the most abundant component in electrical equipment, but it is not the component with the highest damage rate. Resistance damage is the most common with open circuit, the resistance value becomes smaller, and the resistance value becomes very small. The resistors are carbon film resistors, metal film resistors, wirewound resistors and fuse resistors. The first two resistors are the most widely used, and their damage characteristics are low resistance (100Ω or less) and high resistance (100kΩ). The damage rate is high, and the resistance (such as several hundred ohms to several tens of kilo ohms) is very small. Damage; second, when the low-resistance resistance is damaged, it is often burnt and black, which is easy to find, and there is little trace when the high-resistance resistance is damaged.
Wirewound resistors are used for high current limiting and have low resistance. When the cylindrical wirewound resistor is burnt out, some may be black or have a surface blast, crack, and some have no trace. Cement resistance is a kind of wirewound resistor that breaks when burned out, otherwise there is no visible trace. When the fuse is burned out, some surfaces will blow up a piece of skin, and some will have no trace, but it will never burnt and black. Depending on the characteristics, you can focus on checking the resistance and quickly find the damaged resistor.
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