Resistors and Color Codes： Big Boys Race Our Young Girls but Violet Generally Wins

　　可以说是最利用的电子元件，电阻得到很少没有注意时相比，在设计中的其他组件。电阻是无源元件，可以减少电流和电压，使设计者能够实现对电路的控制。如果你在电子方面有任何背景，欧姆定律无疑被永久铭刻在你的脑海里。然而，公平地让我们提供一点背景：

　　电阻的欧姆表示（Ω）是以乔治·西蒙·欧姆的名字命名的。欧姆等于一伏特（v）每安培（a）。欧姆定律决定了一个电阻的行为在一个理想的设置与公式：V = I *，其中V是电压，我是电流和R是电阻。

　　本文的目的是给在Digi-Key电阻概述：我们的产品在我们的网站上有电阻，有颜色编码操作的通孔电阻和电阻不符合常规的颜色代码布局的一些变化。我们也将触及一些情况下，可能使电阻难以读取没有使用工具。

　　Resistor families

　　Resistors are available in a multitude of packages， materials， and with a variety of features. Delving into each type of resistor and their intended application is beyond the scope of this article， however， I want to touch on some of the common types Digi-Key carries. Chassis mount resistors are the monsters of the resistor category. Typically these can have power ratings starting around 5 watts， with the highest power rating we currently stock being upwards of 2.5 kilowatts. As the name implies， chassis mount resistors are typically mounted to a chassis or heatsink to assist in heat transfer. Through-hole resistors can also fall in to a high power category based on the composition and package type. A common high-power package for through-hole resistors is the TO-247 package which lends itself to better heat dissipation. I would suggest reading our article on heat transfer for power resistors for more information. Within the through-hole family are the more common resistor types： axial leaded carbon film and metal film. They range typically from 1/8 watt up to a few watts， granted there are always exceptions. The chip resistor family includes resistors in the typical 0805， 0603 and 0402 packages， as well as a plethora of other physical sizes. Although there are a few higher power options in the chip resistor family， it is rare. They are typically utilized in mid- to low-power applications. Designs that use an array of resistors， typically with the same ohm value， can take advantage of resistor networks. Resistor networks combine two to upwards of twenty-eight resistors in one package; with the most common being four and eight resistors within the same package. Packages are available in chip， SIP （Single In-line Package） and DIP （Dual In-line Package） layout. On a side note： Digi-Key has an additional family within the resistor category that is for specialized resistors. These are typically temperature sensitive resistors focused on temperature compensation circuits.