How to Read a 3-Band Resistor Color Code
Learn how two significant-digit bands and one multiplier band define a 3-band resistor, including its implicit ±20% tolerance.
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Resistor guides
Clear, technically grounded explanations for reading resistor bands and choosing parts with the tolerance, stability, and construction your circuit needs.
Color codes, ratings, and materials
Each guide includes a worked resistor visual, practical checks, common mistakes, and links back to the interactive calculator.
How to Read a 4-Band Resistor Color Code
Read a 4-band resistor by identifying its first two digits, multiplier, and tolerance, with a complete 220 ohm worked example.
How to Read a 5-Band Resistor Color Code
Decode a 5-band resistor using three significant digits, its multiplier, and tolerance, with guidance for precise resistance values.
How to Read a 6-Band Resistor Color Code
Understand all six resistor bands: three significant digits, multiplier, tolerance, and temperature coefficient in parts per million per kelvin.
Resistor Tolerance Explained with Practical Ranges
Learn what resistor tolerance means, how to calculate minimum and maximum resistance, and why tolerance is not the same as accuracy in every condition.
Resistor Temperature Coefficient Explained
Learn how resistor TCR in ppm/K estimates resistance change with temperature and how the sixth color band differs from ordinary tolerance.
Resistor Body Colors and Construction Materials
Understand why resistor body colors vary, what coatings protect, and why body color alone cannot reliably identify a resistor's construction material.
Carbon Film vs Metal Film Resistors
Compare carbon-film and metal-film resistors by tolerance, noise, temperature stability, pulse behavior, cost, and the need to check real datasheets.
Popular resistor values
Open a worked color-code page generated from the same resistor engine as the calculator.