To know the value of resistance color code is needed. These codes are required in form of set of strips or rings. By measure the values of color bands; we can calculate the value of resistance.

Color band A and B: Shows the first two significant figures of resistance in ohm.

Band C: Indicates the decimal multiplier i.e. the values of zero that gives the two significant figures A and B.

Band 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 5% and in silver is 10%. If only three bands are marked on carbon resistance, then it indicates a tolerance of 20%.

Color code for carbon resistance

To mind the sequence of color code following sentence should kept in memory.

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