I. Resistors and Potentiometers 1. Model Naming Method for Resistors and Potentiometers Table 1 Model Naming Method for Resistors Part I: Main Name Part II: Material Part III: Characteristic Classification Part IV: Serial Number Symbol Meaning Symbol Meaning Symbol Meaning Resistor Potentiometer R Resistor T Carbon Film 1 Ordinary Ordinary Products with the same main name and material, but only different performance indicators and sizes, but basically no impact on interchangeability, shall be given the same serial number; if the performance indicators and sizes obviously affect interchangeability, capital letters shall be used after the serial number as a distinguishing code. W Potentiometer H Synthetic film 2 Ordinary Ordinary S Organic solid core 3 Ultra-high frequency ―― N Inorganic solid core 4 High resistance ―― J Metal film 5 High temperature ―― Y Oxide film 6 ―― ―― C Deposition film 7 Precision Precision I Glass glaze film 8 High voltage Special function P Boron carbon film 9 Special Special U Silicon carbon film G High power ―― X Wirewound T Adjustable ―― M Varistor W ―― Fine adjustment G Photosensitive D ―― Multi-turn R Thermistor B For temperature compensation ―― C For temperature measurement ―― P Bypass heating ―― W Voltage regulator ―― Z Positive temperature coefficient ―― 2. Main technical indicators of resistors (1) Rated power The maximum power that a resistor can consume without being damaged or significantly changing its performance when working continuously for a long time in a circuit is called the rated power of the resistor. The rated power of a resistor is not the power that the resistor must consume when working in a circuit, but the maximum power that the resistor is allowed to consume when the circuit is working. Different types of resistors have different series of rated powers, as shown in Table 2.
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