Components
Resistors
Draft for Information Only Resistor Color CodesColored 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 Code4band 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 4band code rules are:
3band code: For 20% resistors, the tolerance ring is colorless. And the three bands are calculated as the first three bands using in the 4band rule, i.e. digit, digit, multiplier 5band 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 5band 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.
Color Code
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