What Is a Resistor Color Code?
Resistors use color-coded bands printed on their ceramic body to indicate their resistance value in ohms (Ω), tolerance, and sometimes temperature coefficient. The color code system was standardized by IEC 60062 and is used universally in electronics manufacturing worldwide. Each color corresponds to a specific digit, multiplier, or tolerance percentage.
How to Read a 4-Band Resistor
A standard 4-band resistor has two digit bands, one multiplier band, and one tolerance band. To read it: hold the resistor with the tolerance band (gold or silver) on the right. Read bands 1 and 2 as the first two digits. Band 3 is the multiplier (multiply the two-digit number by 10 to the power of the multiplier value). Band 4 gives the tolerance — gold means ±5%, silver means ±10%.
Color Code Chart Reference Table
Black = 0 (×1), Brown = 1 (×10, ±1%), Red = 2 (×100, ±2%), Orange = 3 (×1kΩ), Yellow = 4 (×10kΩ), Green = 5 (×100kΩ, ±0.5%), Blue = 6 (×1MΩ, ±0.25%), Violet = 7 (×10MΩ, ±0.1%), Grey = 8 (×100MΩ), White = 9, Gold (×0.1, ±5%), Silver (×0.01, ±10%).
Common Resistor Values in Electronics
The E12 and E24 preferred value series define standard commercial resistor values. Common values include 100Ω, 220Ω, 470Ω, 1kΩ, 4.7kΩ, 10kΩ, 47kΩ, 100kΩ and 1MΩ. Most general-purpose resistors have ±5% tolerance (gold band), while precision circuits use 1% tolerance (brown band) resistors.
Frequently Asked Questions About Resistors
Q: What does Ω mean? Ohm (Ω) is the SI unit of electrical resistance. Q: What is a pull-up resistor? A pull-up resistor connects a digital signal line to VCC to ensure a defined high logic level when no active device drives the line. Q: Can resistors be connected in series? Yes — resistors in series simply add: R_total = R1 + R2 + R3. Q: What about parallel? In parallel: 1/R_total = 1/R1 + 1/R2.
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