The first ring and the second ring of the 4-ring resistance respectively represent the first and second effective values of the resistance of the resistor, and the third ring represents the magnification, that is, the number of zeros after the second effective value. The fourth ring represents the error of the resistance.
The color corresponding to the color of the ring: brown 1, red 2, orange 3, yellow 4, green 5, blue 6, purple 7, gray 8, white 9, black 0. Error of the fourth ring: gold: + -5, silver + -10, brown + -1, red + -2, green + -0.5, blue + -0.25, purple + -0.1, white +50 -20.
For example: red yellow orange gold: is 24000 ohms, is 24k. Error 5%
yellow purple black silver: is 47 ohms, error 10%
red yellow brown silver: 240 ohms, error 10%.
Example: 4-ring resistance In order: red, yellow, red, gold, read as 2700Ω = 2.7K, the error is±5%
Regarding the error rate: the number of error rates of the software must be multiplied by 100. If the calculated error is 0.02, multiply by 100=2%.