The 4.7kΩ resistor shown here has color bands of yellow and violet to begin - which have digit values of 4 and 7 (47). For the first two bands, find that color's corresponding digit value. When decoding the resistor color bands, consult a resistor color code table like the one below. Generally these temperature coefficient values are extremely small, in the ppm range. This indicates the expected change in resistor value as the temperature changes in degrees Celsius. Six band resistors are basically five band resistors with an additional band at the end that indicates the temperature coefficient. Five band resistors also have a wider range of tolerances available. Five and Six Band Resistorsįive band resistors have a third significant digit band between the first two bands and the multiplier band.
How do you tell which band is first and last? The last, tolerance band is often clearly separated from the value bands, and usually it'll either be silver or gold. For example, a 1kΩ resistor with 5% tolerance could actually be anywhere between 0.95kΩ and 1.05kΩ.
No resistor is made to perfection, and different manufacturing processes will result in better or worse tolerances. The tolerance explains how much more or less the actual resistance of the resistor can be compared to what its nominal value is. The final band indicates the tolerance of the resistor. The third band is a weight value, which multiplies the two significant digits by a power of ten. In the standard four band resistors, the first two bands indicate the two most-significant digits of the resistor's value.
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