Carbon film resistors are one of the most classic fixed resistors.
They are made by vacuum spraying a carbon film on a ceramic rod, then cutting spiral grooves to adjust resistance (denser spirals mean higher resistance), and finally sealed with epoxy resin.
The EIA 4-band color code standard is a standard used to represent the resistance value and error of resistors, commonly used for color ring resistors.
In this standard, the resistance color ring is counted from left to right
The first two color rings represent the first two significant digits of the resistance value
The third color ring represents the multiple of multiplication (power of 10)
The fourth color ring represents the tolerance of the resistance. The correspondence between specific colors and numerical values is as follows:
Black: 0
Brown: 1
Red: 2
Orange: 3
Yellow: 4
Green: 5
Blue: 6
Purple: 7
Grey: 8
White: 9
Gold: tolerance is ± 5%
Silver: tolerance is ± 10%
Based on the above criteria, for example
Brown+Black+Red+Gold: Brown represents 1, black represents 0, red represents 10² times, and gold represents an error of ± 5%.
So the resistance of the resistor is 10 × 100 Ω=1000 Ω=1k Ω, with an error range of ± 5%.
Product Features：
FOCMKEAS 4-band carbon film resistor features a ceramic rod + carbon film core. Vacuum spraying ensures uniform carbon film, and precise spiral cutting controls resistance.
The epoxy resin seal enhances flame retardancy and moisture resistance, adapting to most daily environments (e.g., humidity, mild high temperatures).
Application Scenarios：
Suitable for DIY electronics, Arduino projects, electronic experiment teaching, and circuit debugging; also widely used in communication equipment, lighting circuits, robot control, small power supplies, audio devices, new energy accessories, industrial control, medical instrument auxiliary circuits, treadmill electronic modules.