“Why do resistors have different colors?”
When looking at resistors, you might notice that they seem to have different colors. Four in fact, all in different bands. What do they mean and what do they imply? Well believe it or not, this different resistor coloring corresponds to different resistance values. This means that users such as yourself can easily find the resistor they require just by looking at the band colors.
The first band (called band A) represents the first figure, the second one t(band b) represents the second figure (some more precise resistors may have an extra band to indicated a further figure), the third band the Decimal multiplier (meaning how much this figure constructed by the earlier bands will be multiplied by), and the final band represents the tolerance percentage (no band means a 20% tolerance level). A chart of the colors and the corresponding values can be found in the picture above
To get a better idea about how this works, let’s do an example. Let’s say that you find a band with the first band colored gray, the second band colored blue, the third green, and the final one red. This resistor will have a value of 86*10^5 ohms, and a tolerance of +-2%. Now go out there, find yourself some resistors, and try to apply these rules to try to estimated the values!