...用这个引脚作为输出,如果没有这条线,Arduino将不知道如何处理每个引脚。每个管脚只需要配置一次,您只需要配置要使用的管脚。 ...
串联与并联电路 电路可以用许多方法建立。电阻、二极管、开关等电子器件是放置在电路结构中的元件。这些元件的放置对电路的运行至关重要,因为不同的设置会产生不同的输出、结果或目的。两种最简单的电子或电气连接...
...便它们之间都具有相同的电位差。 什么是串联电路(series circuits)? 在串联电路中,元件之间没有连接。然后,根据电荷守恒定律(基尔霍夫第一定律),它们有相同的电流流过。如果电路在任何一点断开,电流将完全停止流过...
... 什么是抵抗(resistance)? The resistance ( ) of a component in a circuit is the potential difference ( ) across the component divided by the current ( ) through the component: 如果在由交流电供电的电路上加一个电阻器,电流的变化将与电压的变化同时发生。 Cur...
...at causes them to oppose changes in current when they are connected in AC circuits. Reactance depends on the frequency of the AC current. For example, for a capacitor with capacitance in an AC circuit with a frequency , the capacitive reactance is given by For an inductor with inductance ,...
... in one direction. As the electr*** flow through various components in the circuit, they lose their electrical energy. DC power refers to the amount of energy dissipated per second by a coulomb of electr***, as they travel between two points in a circuit. In a DC circuit, if a component has a po...
...的电流之比。下图显示了电阻器的两个标准电路符号: Circuit symbols of resistors 在物理上,电阻器通常如下所示: A resistor 广义上讲,电阻器可分为两类:固定电阻器和可变电阻器。正如他们的名字所暗示的,固定电阻器的电阻是...
...一个串联RLC电路。在这里,我们分析了以下电路: An AC circuit containing a resistor, a capacitor and an inductor To recap, the capacitor has a capacitive reactance ( ) given by . The inductor has an inductive reactance ( ) given by . We saw that the magnitude of the total ...
...n.*********.org/wiki/Electric_currenthttp://www.physicsclassroom.com/class/circuits/u9l2c.cfmhttp://www.electronics-tutorials.com/basics/voltage.htmhttp://www.kpsec.freeuk.com/voltage.htmhttp://searchcio-midmarket.techtarget.com/sDefinition/0,,sid183\u gci211871,00.html网址:http://searchcio-...
印刷电路板组件有许多不同类型,用于控制和调节通过特定电路的电流。电阻器、电容器、二极管、晶体管和集成电路(IC)是几乎所有电子设备(从手机到手持收音机)中...