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Carbon film resistance identification
1. Direct marking method: the resistance is marked on the resistor surface with Numbers and unit symbols. The allowable deviation is directly revealed by percentage.
2. Literal symbol method: the nominal resistance is revealed by a regular combination of Arabic numerals and literal symbols, and the allowable deviation is also revealed by literal symbols. The number before the symbol reveals the integer resistance , and the number after it reveals the first decimal resistance and the second decimal resistance in sequence.
3. Color standard method: mark the nominal resistance and allowable deviation on the appearance of the resistor with bands or points of different colors. The color standard method is widely used in foreign countries.