Resistors are essential components in nearly every electronic circuit, controlling current and dividing voltages. Understanding resistor colour codes lets beginners read values quickly without digital tools.
This beginner friendly guide translates bands of colour into ohms, tolerance, and reliability hints you can trust when building or repairing circuits.
| Band | Position | Digit or Multiplier | Tolerance |
|---|---|---|---|
| Brown | 1st or 2nd | 1 | ±1% |
| Red | 1st or 2nd | 2 | ±2% |
| Orange | 1st or 2nd | 3 | — |
| Gold | Multiplier | 0.1 | ±5% |
| Silver | Multiplier | 0.01 | ±10% |
Identifying Resistor Colour Bands
Most axial resistors use four colour bands, while precision types may use five.
Band Sequence on the Resistor
Hold the resistor so the gold or silver tolerance band is on the right side.
The first band is the one closest to this edge, followed by the second, multiplier, and tolerance bands.
Reading the First Two Digits
Each colour corresponds to a number from zero to nine according to the standard code chart.
Mapping Common Colours
Black is 0, brown is 1, red is 2, orange is 3, yellow is 4, green is 5, blue is 6, violet is 7, grey is 8, and white is 9.
Combine the first two band colours to form the base value, such as brown and black for 10 or red and violet for 27.
Understanding the Multiplier Band
The third band tells you how many zeros to add or which power of ten to multiply by.
Orange as a multiplier means ×1000, so a 10k ohm resistor shows brown, black, orange.
Gold and silver appear only here, representing 0.1 and 0.01, which shrink the value for precision parts.
Interpreting Tolerance
Tolerance indicates how far the actual resistance can vary from the stated value.
Gold and Silver Bands
Gold means ±5% tolerance, while silver indicates ±10%, common in older or cost sensitive designs.
Thin Brown Band
A brown tolerance band, seen on some precision resistors, means ±1%, which is typical for measurement equipment.
Practical Tips for Beginners
- Always orient the resistor so the tolerance band is on the right before reading.
- Memorise the digit sequence black through white to speed up identification.
- Practice with real resistors and a multimeter to verify your readings.
- Use online charts as a quick reference until the colour codes become intuitive.
FAQ
Reader questions
What resistor do I choose if the colour code reads red red orange gold?
That combination means 22 with a multiplier of 0.1 and ±5% tolerance, giving 2.2k ohms with medium precision.
Is the first band always the one closest to the tolerance band?
Yes, positioning the tolerance band on the right ensures the first significant band is on the left for consistent reading.
Can a resistor have a blue tolerance band?
Standard EIA codes do not assign tolerance to blue; you will usually see brown, red, or no band for most commercial parts.
How do I read a five band resistor with violet green black orange brown?
Violet green black gives 750, orange multiplies by 1000, and brown indicates ±1%, resulting in 750k ohms with high precision.