电子信息与通信工程专业英语lesson2-1(太原理工大学版).pptVIP

《通信与信息工程专业英语教程》 Outline 大纲 2.1 Circuit and System 电路与系统 2.2 Analog and Digital Circuits Design 模拟与数字电路设计 2.3 Radio Receiver Circuit 无线电接收机电路 2.1 Circuit and System Outline 大纲 Basic concepts 基本概念 Circuit and System 电路与系统 Terminology 术语 charge n.负荷, 电荷, 费用, 主管, 充电, 充气, 装料 conductivity n.传导性, 传导率 insulator n.绝缘体, 绝热器 gravitational adj.重力的 voltage n.[电工]电压, 伏特数 volts n.直流电压 ampere n.安培 ohm n.[物]欧姆 coulomb n.[电]库仑(电量单位) diameter n.直径 inductance n.感应系数, 自感应 dielectric n.电介质, 绝缘体 adj.非传导性的 farad n.[电]法拉(电容单位) polarity n.极性 potential difference [电]电位差，电势差 equivalent resistance 等效电阻 Superposition Theorem 叠加定理 Thevenins Theorem 戴维南定理 Norton s Theorem 诺顿定理 Text tour 文本浏览 In the Bohr theory of the atom (named after Niels Bohr, 1885–1962), electrons orbit a nucleus containing neutrons and protons. Electric charge is measured in coulombs. This relative mobility of electrons within a material is known as electric conductivity. Conductivity is determined by the types of atoms in a material (the number of protons in each atoms nucleus, determining its chemical identity) and how the atoms are linked together with one another. It should also be understood that some materials experience changes in their electrical properties under different conditions. While the normal motion of free electrons in a conductor is random, with no particular direction or speed, electrons can be influenced to move in a coordinated fashion through a conductive material. This uniform motion of electrons is what we call electricity, or electric current. There can be electric current only where there exists a continuous path of conductive material providing a conduit for electrons to travel through. If the path is blocked, the flow will not occur. Electric circuits, voltage and current One volt is defined as