Yellow Black Brown Gold — 400 Ω
Read left to right, starting from the end where the bands are grouped. The gold band is the tolerance and always sits alone at the far end.
Value
400 Ω
Range at ±5%
380 Ω – 420 Ω
Standard value
Non-standard
No E24 part carries this value — check you are reading from the right end.
What each band says
| Band | Colour | Meaning |
|---|---|---|
| 1 | Yellow | 1st digit — 4 |
| 2 | Black | 2nd digit — 0 |
| 3 | Brown | Multiplier — ×10 |
| 4 | Gold | Tolerance — ±5% |
In a circuit
Across 5 V
12.5 mA · 62.5 mW · 1/8 W part
Across 12 V
30 mA · 360 mW · 1 W part
Surface-mount marking for the same value: 401.
If you misread one band
Brown and red, or orange and red, are easy to confuse under a desk lamp. These are the codes one band away from this one.