电气工程专业英语section_2-4.
电气工程及其自动化专业英语答案
第一章⚫Section1习题答案一.Choose the best answer into the blank1.B2.D3.C4.A5.B二.Answer the following questions according to the text1.No. The current need not be a constant-valued function because charge can vary with2.Time.2.The current increases when the time rate of charges is greater.3.The uab=-1V can be interpreted in two ways:①point b is 1 V higher than point a;②the Potential at point a with respect to point b is -1V.4.w=∫pdt5.Because by the passive sign convention,current enters through the positive polarity ofThe voltage,p=ui>0 implies that the element is absorbing power and p=ui<0 impliesThat the element is releasing or supplying power.⚫Section2习题答案一.Choose the best answer into the blank1.B2.A3.B4.C5.B二.Answer the following questions according to the text1.The difference between an independent source and a dependent source is: the source2.Quantity of a dependent source is controlled by another voltage or current,but the source Quantity of an independent source maintains a specified value.3.An ideal independent source is an active element that provides a specified voltage or4.Current that is completely independent of other circuit variables.3.No.The current through an independent voltage source can be calculated by the4.External circuit.4.A voltage-controlled voltage source(VCVS),A current-controlled voltage source (CCVS),A voltage-controlled current source (VCCS), A current-controlled current source (CCCS)5.No,it isn’t.三.Translate the following into Chinese（译文）在随后内容中提及的所有简单电路元件，根据通过它的电流和其两端电压之间的关系进行分类。
电气工程及其自动化专业英语介绍
电气工程及其自动化专业英语介绍Introduction to Electrical Engineering and its AutomationElectrical engineering is a field of study that deals with the design, development, and maintenance of electrical systems and equipment. It involves the application of principles and theories from physics and mathematics to solve problems related to electricity and electronics. With the rapid advancements in technology, electrical engineering has become an integral part of various industries, including power generation, telecommunications, electronics, and automation.The study of electrical engineering equips students with a strong foundation in core subjects such as circuit analysis, electromagnetic theory, power systems, and control systems. These subjects provide students with the necessary knowledge and skills to design, analyze, and optimize electrical systems. Additionally, students also gain hands-on experience through laboratory work and practical projects, which enhance their problem-solving abilities and technical expertise.The specialization in automation within the field of electrical engineering focuses on the application of control systems and computer science to automate industrial processes. Automation plays a crucial role in improving efficiency, productivity, and safety in various industries. Students studying automation learn about programmable logic controllers (PLCs), human-machine interfaces (HMIs), robotics, and computer-aided design (CAD) software. They also acquire skills in programming languages such as C++, Python, and MATLAB, which are essential for designing and implementing automation systems.The curriculum for electrical engineering and its automation specialization covers a wide range of topics to provide students with a comprehensive understanding of the field. Some of the subjects typically included in the program are:1. Circuit Analysis: This subject focuses on the analysis of electrical circuits using techniques such as Ohm's Law, Kirchhoff's Laws, and network theorems. Students learnto analyze and solve complex circuits to determine voltage, current, and power distributions.2. Electromagnetic Theory: This subject deals with the study of electromagnetic fields and their interactions with electrical systems. Students learn about Maxwell's equations, electromagnetic wave propagation, and the behavior of electromagnetic devices such as transformers and motors.3. Power Systems: This subject covers the generation, transmission, and distribution of electrical power. Students learn about power generation technologies, power system components, and the design of electrical grids. They also study power system protection and control to ensure the reliable operation of power networks.4. Control Systems: This subject focuses on the analysis and design of control systems to regulate and optimize the behavior of dynamic systems. Students learn about feedback control, PID controllers, stability analysis, and system modeling. They also gain practical experience in designing and implementing control systems through laboratory experiments.5. Digital Electronics: This subject introduces students to the fundamentals of digital logic circuits and systems. They learn about Boolean algebra, logic gates, flip-flops, and sequential logic. Students also gain hands-on experience in designing and testing digital circuits using simulation software and hardware components.6. Automation and Robotics: This subject explores the principles and applications of automation and robotics in industrial processes. Students learn about industrial automation technologies, robotic manipulators, and sensor integration. They also study topics such as motion planning, trajectory control, and machine vision.7. Computer Programming: This subject provides students with the necessary programming skills to develop software for electrical engineering applications. Students learn programming languages such as C++, Python, and MATLAB. They also gain experience in algorithm development, data analysis, and simulation techniques.Upon graduation, students with a degree in electrical engineering and its automation specialization have excellent career prospects. They can work in various industries, including power generation companies, telecommunications firms, manufacturing companies, and automation solution providers. Job roles for electrical engineering graduates include electrical design engineer, control systems engineer, automation engineer, power systems engineer, and research scientist.In conclusion, electrical engineering and its automation specialization offer students a comprehensive understanding of electrical systems and their automation. The program equips students with theoretical knowledge, practical skills, and programming expertise to design, analyze, and optimize electrical systems. With the increasing demand for automation in various industries, graduates in this field have promising career opportunities.。
电气工程及其自动化专业英语 Chapter 7 Power System Protections
Section 1 Introduction
（6）Phase sequence relays such as (i) negative sequence relays and, (ii) zero sequence relays, （7）Differential relays and percentage differential relays, （8）Distance relays such as (i) plane impedance relays, (ii) angle impedance relays, i.e. Ohm or reactance relays, (iii) angle admittance relays, i.e. Mho relays and, (iv) offset and restricted relays, （9）Pilot relays such as (i) wire pilot relays, (ii) carrier channel pilot relays, (iii) microwave pilot relays.
Chapter 7
Power System Protections
Section 1 Introduction
Text
New Words and Expressions Resume
Exercises
End
Section 1 Introduction
The steady-state operation of a power system is frequently disturbed by various faults on electrical equipment. To maintain the proper operation of the power system, an effective, efficient and reliable protection scheme is required. Power system components are designed to operate under normal operating conditions. However, if due to any reason, say a fault, there is an abnormality, it is necessary that there should be a device which senses these abnormal conditions and if so, the element or component where such an abnormality has taken
Chapter 1 Fundamentals of Electric Circuits section 1-4 Kirchhoff’s Laws 电气工程及其自动化专业英
Exercises
III. Translate the following into Chinese
If a circuit has two or more independent sources, one way to determine the value of a specific variable (voltage or current) is to use nodal or mesh analysis. Another way is to determine the contribution of each independent source to the variable and then add them up. The latter approach is known as the superposition. The superposition principle states that the voltage across (or current through) an element in a linear circuit is the algebraic sum of the voltages across (or currents
(1-15)
Section4 Kirchhoff’s Laws
An alternative form of KCL: The sum of the currents entering a node is equal to the sum of the currents leaving the node.
Since current i1, i3, i4 are entering the node, while currents i2, and i5 are leaving it. By rearranging the Eq.(114), we get
电气工程专业英语section 1-1
Section1 Current and Voltage
flow as the movement of positive charges, that is, opposite to the flow of negative charges, as Fig.l-1 illustrates. This convention was introduced by Benjamin Franklin (l706～l790), the American scientist and inventor. Although we now know that current in metallic conductors is due to negatively charged electrons, we will follow the universally accepted convention that current is the net flow of positive charges. Thus, Electric current is the time rate of charge, measured in amperes (A). Mathematically, the relationship among current i, charge q, and time t is
p ui
(1-6)
Because u and i are generally function of time, the power p in Eq. (1-6) is a time-varying quantity and is called the instantaneous power. The power absorbed or supplied by an element is the product of the voltage across the element and the current through it. If the power has a plus sign, power is being delivered to or absorbed by the element. If,
电气工程专业英语section 2-4
Section 4
Operational Amplifiers
The analog amplifier consists of a basic difference amplifier, implemented by feedback and other compensating amplifying circuits to give linear response, stability, freedom from drift, and other desirable properties.
由于 开始增益是如此大,从l05到l06,所以仅仅 是几微伏的电压差将产生相当大的输 出电压. 由于运算放大器是一种差分放大器,因此, 在两个输入端必须都连接电压才 能使之正常 工作.
Fig.2-5 A symbol for an operational amplifier
Section 4
Operational Amplifiers
Now operational amplifiers are used to make high-quality, low-power analog amplifier, and it is possible to avoid designing individual transistor amplifier stages for many application.
Section 4
Operational Amplifiers
The open-circuit gain is so large, l05 to l06, that a voltage difference of only a few microvolts will give an appreciable output. Because the operational amplifier is a difference amplifier, connections must always be made to both input terminals for proper operation.
电气工程及其自动化专业英语
time-invariant 时不变的
self-(or mutual-)induction 自（互）感
displacement current 位移电流 conductance 电导
voltage drop 电压降 volt-ampere characteristics 伏安特性
metal-filament lamp 金属丝灯泡
seen, increase of current from zero to
I≈I1 causes the terminal voltage of the source to decrease linearly
V12=V=E－VS=E－RSI
Fig.1.3
In other words, the voltage drop VS across the source resistance rises in proportion to the current. This goes on until
(完整版)电气工程及其自动化专业英语第二章课文翻译
第二章第一篇To say that we live in an age of electronics is an understatement. From the omnipresent integrated circuit to the equally omnipresent digital computer, we encounter electronic devices and systems on a daily basis. In every aspect of our increasingly technological society— whether it is science, engineering, medicine, music, maintenance, or even espionage—the role of electronics is large, and it is growing.谈论关于我们生活在一个电子学时代的论调是一种空泛的论调。
从无处不在的集成电路到同样无处不在的数字计算机，我们在日常活动中总会遇到电子设备和电子系统。
在我们日益发展的科技社会的方方面面——无论是在科学、工程、医药、音乐、维修方面甚至是在谍报方面——电子学的作用是巨大的，而且还将不断增强。
In general, all of the tasks with which we shall be concerned can be classified as "signal-processing“tasks. Let us explore the meaning of this term一般说来，我们将要涉及到的工作被归结为“信号——处理”工作，让我们来探究这个术语的含义吧。
A signal is any physical variable whose magnitude or variation with time contains information. This information might involve speech and music, as in radio broadcasting, a physical quantity such as the temperature of the air in a room, or numerical data, such as the record of stock market transactions. The physical variables that can carry information in an electrical system are voltage and current. When we speak of "signals", therefore, we refer implicitly to voltages or currents. However, most of the concepts we discuss can be applied directly to systems with different information-carrying variables. Thus, the behavior of a mechanical system (in which force and velocity are the variables) or a hydraulic system (in which pressure and flow rate are the variables) can often be modeled or represented by an equivalent electrical system. An understanding of the behavior of electrical systems, therefore, provides a basis for understanding a much broader range of phenomena. 信号就是其与时间有关的量值或变化包含信息的任何物理变量。
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Section 4
Operational Amplifiers
After the invention of the transistor, solid-state operational amplifiers were introduced as integrated circuits.
在发明了晶体管后,固态运算放大器被 引入成为集成电路.
Section 4
Operational Amplifiers
ห้องสมุดไป่ตู้
The analog amplifier consists of a basic difference amplifier, implemented by feedback and other compensating amplifying circuits to give linear response, stability, freedom from drift, and other desirable properties.
对于大多数要求放大和 很多测量和控制应用的场合,具有反馈电路 的简单的运算 放大器将满足设计者的需要.
Section 4
Operational Amplifiers
The availability of operational amplifiers as integrated circuits in the form of dual in-line packages (DIPs) or in other compact forms makes the solution of analog signal problems analogous in many respects to the solution of digital logic problems, that is, through the interconnection of integrated circuits. 以双列直插式封装或以其它密封形式出现的 运算放大器做成的集成电路的可用性使 模拟 信号问题在很多方面类似数字逻辑问题那样 得到解决,也就是通过集成电路的 相互连接 得到解决. Operational Amplifier Fig.2-5 shows the symbol for an operational amplifier. There are two inputs: the one marked with a plus sign is the noninverting input, and the one marked with a minus sign is the inverting input.
我们要求它具有复杂性, 因为运算放大器放大直流以及交流信号,在 放大阶段不 允许有容性耦合. Thus it is more difficult to isolate the long-term changes that arise from variations in temperature and power-supply voltage and from other effects that cause the output voltage to drift. 因此我们很难 隔离由温度的变化和电源电压以及其它引起 输出电压漂移的因素 而产生的长效变化.
Now operational amplifiers are used to make high-quality, low-power analog amplifier, and it is possible to avoid designing individual transistor amplifier stages for many application.
现在运算放大器被用来 制造高品质,低功率的模拟放大器,因而我 们可以在很多应用 场合免去了设计单个的晶 体管放大器的过程.
For most amplifying purposes and for many measuring and control applications, simple arrangements of operational amplifiers with feedback circuits will meet the designer's needs.
Introduction Operational amplifiers are high-gain difference amplifiers, which were perfected during World War II. They became the foundation of analog computers, at one time analog computers were called "differential analyzers" because they are used to solve differential equations. 运算放大器是一种高增益的差分放大器, 它在第二次世界大 战期间得到完善,并成为 模拟计算机的基础. 由于运算放大器被用来 解差分方程,因此一段时期内模拟计 算机被 称为"差分分析器". Operational amplifiers are also the basis of many important instruments. 运算放大器也是很多 重要仪器的主要组成部分.
Chapter 2
Electronics
Section 4 Operational Amplifiers
Text
New Words and Expressions Translation of Long Sentences
Exercises
End
Section 4
Operational Amplifiers
模拟放大器由基本的差分放大器组成, 通过反馈以及其它补偿放大电路实现线性反 应 ,稳定性,来自漂移的自由度以及其它 我们所期望的性能.
The complexity is required because operational amplifiers amplify dc as well as ac signals, capacitive coupling between amplifying stages is not permitted.