Carbon Resistors

碳电阻

There are many types of resistors, both fixed and variable. The most common type for electronics use is the carbon resistor. They are made in different physical sizes with power dissipation limits commonly from 1 watt down to 1/8 watt. The resistance value and tolerance can be determined from the standard resistor color code.

有多种电阻器，包括固定电阻和可变电阻。电子应用中最常见的类型是碳电阻。它们有不同的物理尺寸，功率耗散限制通常从1瓦特降至1/8瓦特。电阻值和容差可以通过标准电阻色码确定。

Resistor Color Code

电阻色码

Resistance value,
first three bands.
1st band - 1st digit
2nd band - 2nd digit
3rd band - number
of zeros.

电阻值，前三个色环。第一色环-第一位数字，第二色环-第二位数字，第三色环-零的个数。

0	Black 黑色
1	Brown 布朗
2	Red 红
3	Orange 橙色
4	Yellow 黄色
5	Green 绿色
6	Blue 蓝色
7	Violet 紫光
8	Gray 灰度
9	White 白色

4th band,
tolerance

第4带，容差

5%	Gold 黄金
10%	Silver 银
20%	No band 无带

A variation on the color code is used for precision resistors which may have five colored bands. In that case the first three bands indicate the first three digits of the resistance value and the fourth band indicates the number of zeros. In the five band code the fifth band is gold for 1% resistors and silver for 2%.

对于高精度电阻，也采用一种颜色编码变体，其可能有五种颜色条。在这种情况下，前三个颜色条表示电阻值的前三个数字，第四个颜色条表示零的个数。在五色编码中，第五个颜色条为金色表示1%的电阻，银色表示2%的电阻。

There is another scheme for resistors which have the values stamped on them. Since a decimal point is easy to miss, this code uses R instead of a decimal point. For values over 100 W four numbers are used. The tolerance is indicated by a letter.

电阻器还有另一种标注方法，其数值已直接刻印在上面。由于小数点容易被忽略，这种编码使用R代替小数点。对于大于100 W的数值，使用四个数字进行表示。容差则用字母来表示。

1%	F
2%	G
5%	J
10%	K
20%	M

Examples:

例子：

8R2K = 8.2 W +/- 10% 2202F = 22000 W +/- 1%