Tuesday, August 18, 2015

How to read color coded resistor values

4 Banded resistor
Reading color banded resistor values
This post shows how to read a resistors value by using the chart above. I don't recommend just using this chart to only calculate the resistance of a resistor, I suggest using a multimeter to double check or to check the resister's values. To calculate the value, first locate the first band, it is in the area where the colors bands are closer together like seen on the left picture. The first band of the color band cluster is the first band.
Start calculating the value by matching the first and second or third (three bands if the resistor is a 5 banded resistor) band colors to the chart, the numbers you get are the first 2 or 3 digits or the significant numbers. then find the 3rd or 4rth (4rth band for 5 banded resistor) band color in the chart in the multiplier column. The number you get is the multiplier,  you would multiply the first 2 or 3 digits by the multiplier to get the resistance value. For the fourth or fifth (fifth band for five banded resistor) band, it is not really needed, but after you match the color with the number, it tell you how accurate, the resistance is of the resistor.
Look below at how I find the resistance: