100 Ω resistor colour code
Four bands: Brown · Black · Brown · Gold. The first two give the digits, the third multiplies, the fourth states how far off the real part may be.
Nominal
100 Ω
100 ohms
Real range at ±5%
95 Ω – 105 Ω
A gold band allows this much drift.
Series
E6
Held in almost every parts drawer.
Band by band
| Band | Colour | Meaning |
|---|---|---|
| 1 | Brown | 1st digit — 1 |
| 2 | Black | 2nd digit — 0 |
| 3 | Brown | Multiplier — ×10 |
| 4 | Gold | Tolerance — ±5% |
The same value on a five-band part
Precision resistors carry three significant digits instead of two, so the same 100 Ω looks different.
BrownBlackBlackBrownBrown