100 Ohm resistor Color code of 3 4 and 5 bands

100 ohm carbon resistors are very much useful resistors in practical circuits. These are available with 3, 4 and 5 bands. We need to identify it by solving its color code. In this tutorial post, we’re going to explain how to read the color code of 100 ohm resistor to calculate its resistance without using a multimeter.

To understand the color code of a resistor, you need to know the codes for each color. Here is the resistor color code chart.

100 ohm resistor color code with 3 bands

In 100 ohm, the first two digits are 1 and 0 respectively and the multiplier is 10 as there is only one zero after the two digits. So, the color code for a 3 band 100 ohm resistor will be 101M and the colors of the bands should be Brown, Black and Brown. Here, M refers to no fourth band i.e. 20% tolerance. To know the codes of individual colors, please go through the Carbon resistor color code chart.

Band number	Color	Code
1st band	Brown	1
2nd band	Black	0
3rd band	Brown	1
No tolerance band	–	M

Thus, the color code, 101M = \small \color{Red}100 \Omega \pm 20%.

4 Bands 100 ohm resistor color code

If this resistor has a fourth band that indicates the tolerance of the resistance value is 10%. The color code of the tolerance band is Silver which has an alphabetical code K. Then the color coding for 100 ohm resistor with 4 bands will be 101K and the colors of the bands will be Brown, Black, Brown and Silver.

Band number	Color	Code
1st band	Brown	1
2nd band	Black	0
3rd band	Brown	1
4th Band	Silver (if tolerance is 10%)	K

Thus, the color code 101K = \small \color{Red}100 \Omega \pm 10%.

Resistor Color coding of 100 Ohm resistor with 5 bands

For a five bands 100 ohm resistor, the first three digits are 1, 0 and 0 and the multiplier is 1 i.e. 10⁰ which is coded as “0”. So, the code of a 5 bands 100 ohm resistor with 10% tolerance will be 1000K. The color code of the bands is Brown, Black, Black, Black and Silver.

Band number	Color	Code
1st band	Brown	1
2nd band	Black	0
3rd band	Black	0
4th Band	Black	0
5th Band	Silver (if tolerance is 10%)	K

Thus, the color code, 1000K = \small \color{Red}100 \Omega \pm 10%.

This is all from this article. Hope you understand how to read color code of 100 ohm resistor to calculate its resistance. If you still have any confusion on this topic you can ask me in the comment section.

Thank you!

Related posts:

1. 1k ohm resistor color code
2. 10k resistor color code
3. How to find resistance of Carbon resistors?