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Ohm Bands

Orange Black Brown Gold — 300 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.

30×10±5%
Orange3Black0Brown×10Gold±5%

Value

300 Ω

Range at ±5%

285 Ω – 315 Ω

Standard value

E24

Full page for 300 Ω →


What each band says

BandColourMeaning
1Orange1st digit — 3
2Black2nd digit — 0
3BrownMultiplier — ×10
4GoldTolerance — ±5%

In a circuit

Across 5 V

16.7 mA · 83.3 mW · 1/4 W part

Across 12 V

40 mA · 480 mW · 1 W part

Surface-mount marking for the same value: 301.

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.