Carbon Resistor 0.25 W 5.1 Ω (5.1R)
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Prices updated: 14 Oct 2026
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About this product
A 5.1 Ω carbon resistor rated for 0.25 W, a low-value resistor commonly used for current limiting and general circuit experiments. Its power rating limits the current through it to about 0.22 A and the voltage across it to about 1.13 V before the rating is exceeded.
Specifications
- Resistance
- 5.1 Ω (5.1R) / 5.1 أوم
- Power rating
- 0.25 W / 0.25 وات
- Type
- Carbon resistor / مقاومة كربونية
- Color code (value)
- Green, brown, gold (×0.1) / أخضر، بني، ذهبي (×0.1)
Frequently asked questions
How much current can this resistor carry?
At its 0.25 W rating, the maximum current is about I = √(P/R) = √(0.25/5.1) ≈ 0.22 A. Operating above this risks overheating and changing its value.
How do I read the color code for 5.1 Ω?
Green, brown and gold: green is 5, brown is 1, and the gold band is the ×0.1 multiplier, giving 5.1 Ω. A separate tolerance band may appear on some resistors.
