Colour Coding of Resistance
Category : JEE Main & Advanced
To know the value of resistance colour code is used. These code are printed in form of set of rings or strips. By reading the values of colour bands, we can estimate the value of resistance.
The carbon resistance has normally four coloured rings or bands say A, B, C and D as shown in following figure.
Colour band A and B : Indicate the first two significant figures of resistance in ohm.
B and C : Indicates the decimal multiplier i.e. the number of zeros that follows the two significant figures A and B.
B and D : Indicates the tolerance in percent about the indicated value or in other words it represents the percentage accuracy of the indicated value.
The tolerance in the case of gold is \[\pm 5%\] and in silver is \[\pm 10%\]. If only three bands are marked on carbon resistance, then it indicate a tolerance of 20%.
Colour code for carbon resistance
| Letters as an aid to memory | Colour | Figure (A, B) | Multiplier (C) |
| B | Black | 0 | \[{{10}^{o}}\] |
| B | Brown | 1 | \[{{10}^{1}}\] |
| R | Red | 2 | \[{{10}^{2}}\] |
| O | Orange | 3 | \[{{10}^{3}}\] |
| Y | Yellow | 4 | \[{{10}^{4}}\] |
| G | Green | 5 | \[{{10}^{5}}\] |
| B | Blue | 6 | \[{{10}^{6}}\] |
| V | Violet | 7 | \[{{10}^{7}}\] |
| G | Grey | 8 | \[{{10}^{8}}\] |
| W | White | 9 | \[{{10}^{9}}\] |
To remember the sequence of colour code following sentence should kept in memory.
B B R O Y Great Britain Very Good Wife.
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