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电阻器色环代码、阻值与公差

根据电阻器色环确定阻值、倍率和公差。

electricalresistorcolourcode

概述

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The resistor color code is an international standard for marking the resistance value and tolerance of axial-lead through-hole resistors. Each colored band on the resistor body encodes a digit, multiplier, or tolerance specification. This system enables quick identification without requiring measurement instruments.

电阻使用四带（标准容差）或五带（精密容差）。 The first band is always located nearest one end of the resistor body.

下载并打印电阻 — 标准色码表。

关键公式

Four-Band Resistance Value

R=(D1×10+D2)×10MR = (D_1 \times 10 + D_2) \times 10^{M}

其中 D1D_1 和 D2D_2 为前两个有效数字，MM 为乘数指数。

Five-Band Resistance Value

R=(D1×100+D2×10+D3)×10MR = (D_1 \times 100 + D_2 \times 10 + D_3) \times 10^{M}

其中 D1D_1、D2D_2 和 D3D_3 为前三个有效数字，MM 为乘数指数。

Actual Resistance Range

Ractual=Rnominal×(1±Tolerance100)R_{\text{actual}} = R_{\text{nominal}} \times \left(1 \pm \frac{\text{Tolerance}}{100}\right)

变量

符号说明单位
RRNominal resistanceΩ
DnD_nSignificant digit from color band—
MMMultiplier exponent from color band—
RactualR_{\text{actual}}Actual resistance within toleranceΩ

Color Code Reference

13 行
有效数字、乘数和容差的标准电阻色码
公差
Black0×1—
Brown1×10±1%
Red2×100±2%
Orange3×1 k—
Yellow4×10 k—
Green5×100 k±0.5%
Blue6×1 M±0.25%
Violet7×10 M±0.1%
Grey8×100 M—
White9×1 G—
Gold—×0.1±5%
Silver—×0.01±10%
None——±20%

来源: engineeringtoolbox.com

Interactive Standard Color Code Chart

The original resistors_standard_color_codes.png image is represented below as numeric color-code data. The multiplier value is shown as a base-10 exponent so gold and silver can be included with the standard digit colors.

电阻器s - 标准 Color Codes

How to Read Resistor Bands

Four-Band Resistors

  1. Band 1 — First significant digit.
  2. Band 2 — Second significant digit.
  3. Band 3 — Multiplier (power of ten).
  4. Band 4 — Tolerance (gold = ±5%, silver = ±10%, none = ±20%).

Example: Yellow, Violet, Orange, Red → (4×10+7)×103=47 000  Ω(4 \times 10 + 7) \times 10^{3} = 47\,000\;\Omega with ±2% tolerance.

Five-Band Resistors

  1. Band 1 — First significant digit.
  2. Band 2 — Second significant digit.
  3. Band 3 — Third significant digit.
  4. Band 4 — Multiplier.
  5. Band 5 — Tolerance (brown = ±1%, red = ±2%).

Example: Red, Yellow, White, Orange, Brown → (2×100+4×10+9)×103=249 000  Ω(2 \times 100 + 4 \times 10 + 9) \times 10^{3} = 249\,000\;\Omega with ±1% tolerance.

计算器

Four-Band 电阻 计算器

Five-Band 电阻 计算器

单位换算器

Electrical 电阻 单位 转换器

还原的原始源表

以下表格还原自原始来源页面，以保留完整的参考数据。

Resistors - Color Codes

13 行
Resistors - Color Codes
公差
Silver—10^-2+/- 10%
Gold—10^-1+/- 5%
Black01—
Brown110+/- 1%
Red210^2+/- 2%
Orange310^3—
Yellow410^4—
Green510^5+/- 0.5%
Blue610^6+/- 0.25%
Violet710^7+/- 0.1%
Grey810^8—
White910^9—
None——+/- 20%

来源: engineeringtoolbox.com

Download and print Resistors - Standard Colors Codes table.

Four Band Resistor Calculator

2 行
Four Band Resistor Calculator
Band 1 options: None, Brown, Red, Orange, Yellow, Green, Blue, Violet, Gray, WhiteBand 2 options: None, Black, Brown, Red, Orange, Yellow, Green, Blue, Violet, Gray, WhiteMultiplier options: None, Black, Brown, Red, Orange, Yellow, Green, Blue, Gold, SilverTolerance options: None, Brown, Red, Gold, Silver
47 kOhm +/- 2%47 kOhm +/- 2%47 kOhm +/- 2%47 kOhm +/- 2%

来源: engineeringtoolbox.com

Five Band Resistor Calculator

2 行
Five Band Resistor Calculator
Band 1 options: None, Brown, Red, Orange, Yellow, Green, Blue, Violet, Gray, WhiteBand 2 options: None, Black, Brown, Red, Orange, Yellow, Green, Blue, Violet, Gray, WhiteBand 3 options: None, Black, Brown, Red, Orange, Yellow, Green, Blue, Violet, Gray, WhiteMultiplier options: None, Black, Brown, Red, Orange, Yellow, Green, Blue, Gold, SilverTolerance options: None, Brown, Red, Gold, Silver
249 kOhm +/- 1%249 kOhm +/- 1%249 kOhm +/- 1%249 kOhm +/- 1%249 kOhm +/- 1%

来源: engineeringtoolbox.com

原始源图

以下原始来源图像予以保留，以免丢失视觉参考资料。当图像包含图表或表格数据时，其提取值已呈现在页面的表格、计算器或交互式图表中；其余图像保留为视觉来源参考。

electrical resistor color codes Resistors - Standard color codes

工程要点

  • Reading direction: If the resistor has a gold or silver band, that band is always the tolerance band and should be read from the opposite end. When no metallic band is present, read from the end closest to the first band.
  • Temperature coefficient: A sixth band (rare) indicates the temperature coefficient in ppm/°C, typically using the same color-to-digit mapping.
  • Surface-mount devices (SMD): Modern chip resistors use a printed numerical code (e.g., "473" = 47 × 10³ = 47 kΩ) or the EIA-96 marking system rather than color bands.
  • Standard values: Resistors follow the E-series (E12, E24, E48, E96, E192) preferred-value grids. Not every arbitrary resistance is manufactured; available values follow logarithmic spacing within each decade.
  • Tolerance stacking: When combining resistors in series or parallel, the resulting tolerance is generally tighter than individual tolerances due to statistical averaging, but worst-case analysis should use simple addition of absolute deviations.

参考资料

来源: engineeringtoolbox.com