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Hsc er boi e color code er alochona ache.rodoke 4 ti colour thakle tar calculation kivabe hobe ta deya ache.but ami kicu rodoke 5 ti colour dekhechi.atar calculation hobe kivabe?

"Resistors manufactured for military use may also include a fifth band which indicates component failure rate (reliability); "
http://en.wikipedia.org/wiki/Electronic_color_code

yes, Moon vai...I have known that 5th band means failure rate from the book Basic Electronics....but I cant understand what is failure rate..even there was no explanation on this book..so I want to know about this