Today, Carrie Anne is going to take a look at how those transistors we talked about last episode can be used to perform complex actions. With the just two states, on and off, the flow of electricity can be used to perform a number of logical operations, which are guided by a branch of mathematics called Boolean Algebra. We’re going to focus on three fundamental operations - NOT, AND, and OR - and show how they were created in a series of really useful circuits. And its these simple electrical circuits that lay the groundwork for our much more complex machines.

今天，Carrie Anne要看一看我们上一集讲的晶体管是如何被用来执行复杂的动作的。只有开和关两种状态，电流就可以用来执行许多逻辑运算，这些运算是由一个叫做布尔代数的数学分支来指导的。我们将集中讨论三个基本的运算—NOT，AND，AND OR—并展示它们是如何在一系列非常有用的电路中产生的。正是这些简单的电路为我们更复杂的机器打下了基础。