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Most high quality resistors has got a sixth band of colour.

This band indicates Temperature Coefficient in PPM (Parts per million).

These resistors typically only rise in value within their specified range of temperature.

Note:

All resistors vary slightly whether they are marked with temperature coefficient or not. Those unmarked colorful resistors typically have a TC of 200 PPM or more. The problem with the unmarked resistors is also that we do not know exactly how they behave when being exposed to higher temperature. Most will have increased values. Some will have decreased values. Others will have a combination of these for different temperatures.

Color codes used on resistors are:

(Look at related question below for a full explanation of these, including calculating temperature drift.)

Colour valueMultiplierToleranceTemperature CoefficientSilver 0,01Silver 10%Gold 0,1Gold 5%Black 01Brown 1101%100ppmRed 21002%50ppmOrange 31k15ppmYellow 410k25ppmGreen 5100k0,50%Blue 61M0,25%Violet 710M0,10%Gray 80,05%White 9

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