专业英语1-5课案.doc

--------1.1new words and expressions------------ element元件 interconnect 使互相连接 node 节点 branch分流 loop回路; topology 布局 configuration配置 terminal终端;接线端 resistor 电阻器 independent 独立自由者;不受约束 series 串联 parallel 并联 impedance 阻抗 全电阻 theorem 定理 法则  ①To differentiate between a circuit and a network, we may regard a network as an interconnection of elements or devices, whereas a circuit is a network providing one or more closed paths.. ①为了区别网络和电路，可以认为网络是若干元件或装置的相互连接，而电路则是指具有一个或多个闭合路径的网络。 ②If a short circuit (a connecting wire) connects tow nodes ,the tow nodes constitute a single node. ②如果2个节点间用一根短路线连接，则此2个节点构成1个单节点。 ③The 2Ω resistor, the 3Ω resistor, and the current source are in parallel because they are connected to the same tow nodes(b and c) and consequently have the same voltage across them. ③2Ω电阻、3Ω电阻和电流源是接在相同的两个节点（b和c）上，即这3个元件是并联连接的，因此各元件上的电压相同。 ④The sign on each voltage is the polarity of the terminal encountered first as we travel around the loop. We can start with any branch and go around the loop either clockwise or counterclockwise. Suppose we start with the voltage source and go clockwise around the loop as shown; then voltages would be –v1,+v2,+v3,-v4, and +v5,in that order. ④顺着环路来看，每个电压的符号就是首先遇到的端子的即兴。绕行回路可以从任一支路开始，绕行方向可以顺时针，也可以是逆时针。假设我们从电压源开始，顺时针绕环路一圈，那么按顺序的电压取值分别为–v1,+v2,+v3,-v4,-v5。 --------1.2new words and expressions------------ analog 模拟 digital 数字 thermometer 温度计 Fahrenheit华氏温度计 drum 鼓声 discrete离散的 不连续的 original 原始的 独创的 原物 原作 remote 偏僻的 细微的 bulb 电灯泡 pulse 脉冲 buzzer 蜂鸣器 manipulate操纵；操作；—ON and OFF. Digital systems carry information using combinations of ON – OFF electrical signals that are usually in the form of codes that represent the information. ①数字量是离散变化的，。在大多数情况下，离散信号只有两种状态：导通和截止。数字系统通过导通和截至的电信号组合来表示信息，通常以编码的形式反映出来。 ②The sender keeps the same shorter time interval between letters but a longer time interval between words. This allows the receiver to identify that the code sent is a character in a word or the end of a word itself. The T is one dash(