Yellow Red Black Gold — 42 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
42 Ω
Range at ±5%
39.9 Ω – 44.1 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 | Red | 2nd digit — 2 |
| 3 | Black | Multiplier — ×1 |
| 4 | Gold | Tolerance — ±5% |
In a circuit
Across 5 V
119 mA · 595 mW · 2 W part
Across 12 V
286 mA · 3.43 W · part
Surface-mount marking for the same value: 420.
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.