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Tolerance band in a resistor????

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zara:
hey,
ny1 studyin IGCSE DnT can plzz tll m d purpose of a tolerance band in the resistor ???
i hv no clue to it.....
n i need d answer urgently...plzzzzz
Thanks..

astarmathsandphysics:
It is a measure of how accurate the stated resistance is. Normally a resistance has 3 or 4 bands. The 1st 3 show the value of the resistance. If there is no 4th band the accuracy is +-20%, a silver 4th band means an accuracy of +-10% and a gold band +-5%.

ashgerrard:
Do we have to know it in our IGCSE physics syllabus??

astarmathsandphysics:
Beats me. I only answer the maths and physics questions.

sweetsh:
I dont think it is in IGCSE Physics syllabus..

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