Resistance Value Query app for iPhone and iPad

The first two color rings represent the first two digits of the resistance value, in ohms. On a three or four ring resistor, the third colored ring represents the amplification factor. This amplification can change the position of the decimal places to represent any order of magnitude from megaohms to milliohms. The fourth colored circle represents the tolerance. Remember, if there is no such color ring on the 3-ring resistor, the default tolerance is 20%.

5-ring or 6-ring resistor
The high-precision resistor has another color ring to represent the third Significant figures. If your resistor has 5 or 6 color rings, the third color ring is this color ring, which together with the first and second color rings represents numbers. Looking to the right again, the fourth colored circle represents magnification, and the fifth represents tolerance. The 6-ring resistor and 5-ring resistor are basically of the same type, and the additional color ring represents reliability or temperature coefficient (ppm/K) specifications. Taking brown, the most commonly used color in the sixth color ring, as an example, for every 10 ℃ temperature change, the resistance will change by 0.1%.

1. The color ring resistor is divided into four color rings and five color rings, lets talk about the four color ring first.
Black 0 brown 1 red 2 orange 3 yellow 4 green 5 blue 6 purple 7 gray 8 white 9 gold and silver represent errors
The meanings of each colored ring are as follows:
The first color ring: the first digit of the resistance value;
The second color ring: the second digit of the resistance value;

The third color ring: the idempotent of 10;
Fourth color ring: error representation.
For example: resistance color ring: brown green red gold
First place: 1;
Second place: 5;
The power of 10 is 2 (i.e. 100);
Error of 5%
The resistance value is: 15X100=1500 ohms=1.5 kiloohms=1.5K

2. A more accurate "five color ring" resistor is used to represent the resistance value of the resistor with five color rings, as follows:
The first color ring: the first digit of the resistance value;
The second color ring: the second digit of the resistance value;
The third color ring: the third digit of the resistance value;
The fourth color ring: the idempotent of 10 of the resistance multiplier;
Fifth color ring: error (usually brown, error is 1%)
The resistance error of the four color ring is 5-10%, while the resistance error of the five color ring is usually 1%, which improves the accuracy

For example, with resistance: yellow purple red brown
The first three digits are: 472
The fourth digit represents the 3rd power of 10, which is 1000
The resistance value is 472X1000 ohms=472K ohms (i.e. 472K)