The resistance of the conductor to the current is called resistance, which is represented by the symbol R, and the units are ohms, kiloohms, and megaohms, which are represented by Ω, kΩ, and MΩ respectively.

 

Model naming method of resistance:

The model of domestic resistors consists of four parts (not applicable to sensitive resistors)

The first part: the main title, expressed in letters, to indicate the name of the product. For example, R means resistance, W means potentiometer.

The second part: material, indicated by letters, which means the resistor body is composed of what material, T-carbon film, H-synthetic carbon film, S-organic solid, N-inorganic solid, J-metal film, Y-nitride film, C-deposited film, I-glass glaze film, X-wire wound.

The third part: classification, which is generally represented by numbers, and individual types are represented by letters, which indicate what type of product belongs to. 1-normal, 2-normal, 3-ultra-high frequency, 4-high resistance, 5-high temperature, 6-precision, 7-precision, 8-high voltage, 9-special, G-high power, T-adjustable.

The fourth part: the serial number, expressed by numbers, indicates different varieties of similar products, to distinguish the product’s external dimensions and performance indicators, etc.

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