Many Resistors have high resistance values, sometimes in mega ohms.
Carbon-composition and Carbon-film resistors are too small to have resistance values printed on them.
If we print resistance values, there is a chance of fading out the numbers and whole calculations would go wrong then. Instead of this we give colour codes which has following advantages:
1. Even if half part of the colour band fades out we still can recognise the value.
2. Readable from any position. It is easy to identify a colour from a little longer distance than every time taking a closer look at numbers printed.
3. These are industry standard colour codes and have same values everywhere.
4. Tolerance values can also be printed. If we print large resistance values then there would be no space available to print tolerance values.
5. It's easier to read if you know the code. Mnemonics are available to learn the codes easily.
6. Colour codes can be easily tested by a machine. Also while production, resistors can be easily labeled.
By : Nikhil-Achole
Carbon-composition and Carbon-film resistors are too small to have resistance values printed on them.
If we print resistance values, there is a chance of fading out the numbers and whole calculations would go wrong then. Instead of this we give colour codes which has following advantages:
1. Even if half part of the colour band fades out we still can recognise the value.
2. Readable from any position. It is easy to identify a colour from a little longer distance than every time taking a closer look at numbers printed.
3. These are industry standard colour codes and have same values everywhere.
4. Tolerance values can also be printed. If we print large resistance values then there would be no space available to print tolerance values.
5. It's easier to read if you know the code. Mnemonics are available to learn the codes easily.
6. Colour codes can be easily tested by a machine. Also while production, resistors can be easily labeled.
By : Nikhil-Achole
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