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Resistor Color Codes
Colored bands are used to identify the value of a resistor. Sometimes the colored bands are grouped close to one end of the resistor and with one single band located at the other end. But all colored bands can also be evenly spaced together closely to one end. The leading colored band is the band nearest to a lead wire.
Type of Color Code
4-band code: For low precision resistors, with tolerances 5%, 10%, or 20%, only two most significant digits are needed to represent the value of a resistor. The 4-band code rules are:
3-band code: For 20% resistors, the tolerance ring is colorless. And the three bands are calculated as the first three bands using in the 4-band rule, i.e. digit, digit, multiplier
5-band code: For high precision resistors, with tolerances 2%, 1%, or lower, three most significant digits are needed to represent the value of a resistor. The 5-band code rules are:
Additional band: For special purpose resistors, an additional colored band is needed to represent the temperature coefficient or the reliability of a resistor.
ID: 110800010 Last Updated: 8/6/2011 Revision: 0
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