Build Your First Robot - Reading Resistors

This post will be the concluding post for resistors. In this post I will mainly concentrate on reading the value of a common resistor. This post should have been the second post in the resistor series but as I was keener in going into the math and principle behind resistors, I completely forgot to write this post.

As resistors are very small, printing their values on them was too difficult and costly in the olden times. Hence they resorted to print colored bands on the resistors that later could be used to interpret their values. There are usually four bands on a resistor. The first band gives us the first digit of the total resistance. The second band gives the second digit of the resistance. The third band gives the number of zeros. The fourth band tells us the percentage by which the actual resistance of the resistor would vary compared to the printed value.

For resistors with 5 or 6 bands, you can use this chart to interpret their values.

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