自动化专业英语第三版
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自动化专业英语第三版课程设计一、课程介绍自动化专业英语是用于培养自动化工程技术人员英语语言技能的专业英语教材。
本课程加强与工程实践的链接,旨在提高学生在从事自动化工程以及国际交流中的英语交流能力,以及跨学科的能力和跨文化的意识。
二、课程目标1.掌握英语专业语言,能够在自动化工程实践中进行专业交流;2.学习跨文化交流技巧,能够适应国际化工作环境;3.培养自主学习能力,能够应对本专业以及国际领域的新知识和新技术。
三、教学内容1.自动化专业英语语言知识的学习,包括英语语法、词汇、语音、听力、口语和阅读;2.自动化技术的专业知识,包括控制原理、自动控制技术、自动化测试技术等;3.跨文化交际技能,包括英语交际技能、跨文化沟通技能、国际商务礼仪等。
四、教学方法1.采用任务型教学方法,将学生置于具有实际意义和应用价值的交际情境中,在任务中体验与学习;2.采用多媒体教学手段,帮助学生提高听力、阅读、写作和口语能力;3.采用小组合作学习,提高学生自学、协作和交流能力。
五、课程评估1.平时成绩:包括英语学习情况、任务完成情况、小组合作学习情况等,占60%;2.期末考试:考察学生英语语言知识和自动化专业知识,占40%;3.开展英语技能竞赛:鼓励学生积极参与各类英语技能比赛,提高语言水平。
六、参考教材1.《自动化专业英语》第三版朱洁莉等编西安石油大学出版社;2.《自动化控制原理》第四版邵幸民等编机械工业出版社;3.《自动化测试技术》第二版高世红编冶金工业出版社。
七、教学进度安排章节教学内容教学时间第一章英语语言知识2周章节教学内容教学时间第二章自动化技术简介1周第三章控制原理2周第四章自动控制技术2周第五章自动化测试技术2周第六章跨文化交流技能2周第七章国际商务礼仪1周第八章综合实验3周八、总结本课程旨在提高自动化专业学生的英语语言能力和自主学习能力,将学生引入到实际的工程项目中,培养学生的跨学科、跨文化、应变能力。
我们相信,通过学习和实践,学生将获得宝贵的知识和技能,为未来的职业生涯打下坚实的基础。
自动化专业英语Title: Professional English in AutomationIntroduction:Professional English in the field of automation is essential for effective communication and collaboration in the industry. It is important for professionals in this field to have a strong command of technical vocabulary and terminology to ensure accuracy and clarity in their work. In this article, we will explore the importance of professional English in automation and provide some tips for improving language skills in this specialized area.1. Importance of Professional English in Automation1.1. Precision and Accuracy: In the field of automation, precision and accuracy are crucial for successful project implementation. Professional English helps in conveying technical information accurately, reducing the risk of errors and misunderstandings.1.2. Global Communication: Automation projects often involve collaboration with international partners and clients. Professional English enables professionals to communicate effectively with colleagues from different linguistic backgrounds, ensuring smooth and efficient project execution.1.3. Compliance and Documentation: In the automation industry, compliance with regulations and standards is paramount. Professional English is essential for drafting reports, manuals, and documentation that meet industry requirements and ensure legal compliance.2. Tips for Improving Professional English Skills in Automation2.1. Vocabulary Building: To enhance professional English skills in automation, professionals should focus on building a strong technical vocabulary. This can be achieved through reading technical journals, attending industry conferences, and participating in specialized training programs.2.2. Practice Writing: Writing is an important aspect of professional communication in automation. Professionals can improve their writing skills by practicing technical writing, drafting project reports, and creating documentation for automation systems.2.3. Communication Skills: Effective communication is key in the field of automation. Professionals should work on developing their listening, speaking, and presentation skills to ensure clear and concise communication with colleagues, clients, and stakeholders.3. Resources for Learning Professional English in Automation3.1. Online Courses: There are many online courses available that focus on professional English in automation. These courses cover technical vocabulary, writing skills, and communication strategies specific to the industry.3.2. Industry Publications: Reading industry publications such as journals, magazines, and research papers can help professionals stay updated on the latest trends and developments in automation while improving their professional English skills.3.3. Language Workshops: Participating in language workshops and seminars tailored to the automation industry can provide professionals with valuable opportunities to practice their English skills and receive feedback from language experts.4. Challenges in Professional English for Automation Professionals4.1. Jargon and Acronyms: The automation industry is filled with technical jargon and acronyms that can be challenging for non-native English speakers to understand and use correctly.4.2. Cultural Differences: Working in a globalized industry like automation can expose professionals to different cultural norms and communication styles. Understanding and navigating these differences can be a challenge for non-native English speakers.4.3. Time Constraints: Professionals in the automation industry often face tight deadlines and demanding workloads, leaving little time for language improvement. Finding time to dedicate to language learning can be a significant challenge.5. Benefits of Improving Professional English Skills in Automation5.1. Career Advancement: Strong professional English skills can open up new opportunities for automation professionals, including career advancement, international assignments, and higher salaries.5.2. Enhanced Collaboration: Improved communication through professional English can lead to better collaboration with colleagues, clients, and partners, resulting in more successful projects and outcomes.5.3. Personal Development: Developing professional English skills in automation can boost professionals' confidence, expand their knowledge base, and contribute to their overall personal and professional growth.In conclusion, professional English skills are essential for automation professionals to succeed in their careers and effectively communicate in the industry. By focusing on vocabulary building, writing practice, and communication skills development, professionals can enhance their language proficiency and achieve greater success in the field of automation.。
自动化专业英语自动化专业英语是指在自动化领域中使用英语进行交流和表达的专业英语。
自动化是一门综合性学科,涉及到机械、电子、计算机、控制等多个领域,因此在专业英语中需要掌握相关的词汇、表达方式和专业知识。
一、自动化专业英语词汇1. Automation(自动化):The technique of making an apparatus, a process, or a system operate automatically.2. Control system(控制系统):A system that manages, commands, directs, or regulates the behavior of other devices or systems.3. Programmable logic controller (PLC)(可编程逻辑控制器):A digital computer used for automation of electromechanical processes.4. Sensor(传感器):A device that detects and responds to some type of input from the physical environment.5. Actuator(执行器):A component of a machine that is responsible for moving or controlling a mechanism.6. Feedback(反馈):The process of returning part of the output of a system to its input.7. Process control(过程控制):A system that uses sensors and feedback to automatically adjust the operation of a process.8. Industrial robot(工业机器人):A robot system used for manufacturing, assembly, or material handling tasks.9. Human-machine interface (HMI)(人机界面):The point of interaction between a human operator and a machine.10. SCADA (Supervisory Control and Data Acquisition)(监控与数据采集系统):A system for remote monitoring and control of industrial processes.二、自动化专业英语表达方式1. Describing a process(描述过程):To begin with, the raw materials are fed into the production line. Then, the sensors detect the input and send signals to the control system. The control system processes the signals and adjusts the parameters of the actuators accordingly. This ensures that the production process is carried out smoothly and efficiently.2. Explaining a control system(解释控制系统):A control system consists of several components, including sensors, actuators, and a programmable logic controller (PLC). The sensors detect the input from the environment and send signals to the PLC. The PLC processes the signals and sends commands to the actuators. The actuators then move or control the mechanism based on the commands received. This allows the control system to regulate and maintain the desired behavior of the system.3. Discussing the importance of automation(讨论自动化的重要性):Automation plays a crucial role in various industries. It improves efficiency, reduces human error, and increases productivity. By automating repetitive tasks, companies can save time and resources. Moreover, automation enables real-time monitoring and controlof processes, leading to better quality control and higher safety levels. In addition, automation allows for flexibility and scalability, as systems can be easily reprogrammedor reconfigured to adapt to changing requirements.4. Presenting the benefits of using industrial robots(介绍使用工业机器人的好处):Industrial robots have revolutionized manufacturing processes. They can perform repetitive tasks with high precision and speed, resulting in increased productivity.Furthermore, robots can operate in hazardous environments, reducing the risk to human workers. With their ability to handle heavy loads and work for extended periods, robots contribute to cost savings and improved efficiency. Additionally, robots can be programmed to perform complex tasks, such as assembly or welding, with minimal errors.三、自动化专业英语专业知识1. PID control(PID控制):A control technique used in feedback control systems. It calculates an error value as the difference between the desired setpoint and the measured process variable. The control algorithm adjusts the output based on proportional, integral, and derivative terms to minimize the error and achieve stable control.2. Robotics(机器人技术):The branch of engineering and science that deals with the design, construction, operation, and application of robots. It encompasses mechanical engineering, electrical engineering, computer science, and artificial intelligence.3. PLC programming(PLC编程):The process of creating a set of instructions for a programmable logic controller. It involves defining input and output signals, designing the control logic, and implementing the desired functionality.4. HMI design(人机界面设计):The process of creating an interface between a human operator and a machine. It involves designing user-friendly screens, buttons, and menus to facilitate interaction and control.5. SCADA system architecture(SCADA系统架构):The structure and components of a supervisory control and data acquisition system. It typically consists of a human-machine interface, remote terminal units, communication networks, and a central control station.以上是关于自动化专业英语的标准格式文本,涵盖了词汇、表达方式和专业知识。
自动化专业英语第三版1.1 介绍过程控制1.近年来,对过程系统的性能改善需求变得越来越困难. 更为激烈的竞争,更加严格的环境和安全规范,以及快速变化的经济条件都是加强工厂产品质量规范的关键因素2.更为复杂的情况是,由于现代制造业朝着规模更大,集成度更高的方向发展,而使不同的加工环节之间的协调能力更低, 所以加工过程更难控制.在这种工厂中,要想让一个生产环节出现的问题不对其相连的另一个生产环节产生影响,几乎是不可能的.3.近年来,考虑到工业制造逐渐加强的安全、高效需求,过程控制这个课题变得越来越受重视.实际上,对于大多数现代工业,要满足安全、高效,产品质量的要求,没有控制系统是不可能的.1.1.1说明性的例子1.图1.1.1 所示的连续加热搅拌器可以作为过程控制的典型例子.输入液态流体的质量流量率为w,温度为Ti. 槽内成分搅拌均匀,并且用电加热器,功率为Q瓦特.2.假设输入和输出流量率是相等的,并且液体密度保持恒定,也就是说温度变化足够小,密度对温度的影响可以忽略不计. 在这些条件下,槽内液体的体积保持恒定3.加热搅拌器的控制目标是保持输出温度T在一个恒定参考值TR上.参考值在控制术语中指的是给定值. 下面我们考虑两个问题.把加热搅拌器内的液体从输入温度Ti加热到输出温度TR,需要多少热量?1.要确定达到设计运行条件下的热量需求,我们需要写下槽内液体的稳定能量平衡式.在写平衡式之前,假设槽内是完美搅拌的,同时忽略热损耗.2.在这些条件下,槽内成分的温度保持一致,因此,输出温度等于槽内液体温度..3.分别表示Ti, T, w, 和 QC 是液体的比热. 我们假设C是恒定的. 在设计条件下,将其代入方程(1),1.方程(2)是加热器的设计方程.如果我们的假设是正确的,同时输入流量和输入温度等于他们的标定值,那么有方程(2)给出的输入热量将使输出温度保持在期望值TR.但是,如果给定条件变化,会产生什么样的结果呢?这给我们带来第二个问题:2.问题2. 假设输入温度Ti随时间变化. 我们如何确保温度T保持或靠近给定值TR?最为一个特殊的例子,假设Ti增加到一个大于的值. 如果Q保持在标定值上恒定,我们可以得到输出温度将增加,因此T>TR.为应付这种情况,有一些可能的策略控制出口温度T方法1。
自动化专业英语第三版1.1 介绍过程控制1.近年来,对过程系统的性能改善需求变得越来越困难. 更为激烈的竞争,更加严格的环境和安全规范,以及快速变化的经济条件都是加强工厂产品质量规范的关键因素2.更为复杂的情况是,由于现代制造业朝着规模更大,集成度更高的方向发展,而使不同的加工环节之间的协调能力更低, 所以加工过程更难控制.在这种工厂中,要想让一个生产环节出现的问题不对其相连的另一个生产环节产生影响,几乎是不可能的.3.近年来,考虑到工业制造逐渐加强的安全、高效需求,过程控制这个课题变得越来越受重视.实际上,对于大多数现代工业,要满足安全、高效,产品质量的要求,没有控制系统是不可能的.1.1.1说明性的例子1.图1.1.1 所示的连续加热搅拌器可以作为过程控制的典型例子.输入液态流体的质量流量率为w,温度为Ti. 槽内成分搅拌均匀,并且用电加热器,功率为Q瓦特.2.假设输入和输出流量率是相等的,并且液体密度保持恒定,也就是说温度变化足够小,密度对温度的影响可以忽略不计. 在这些条件下,槽内液体的体积保持恒定3.加热搅拌器的控制目标是保持输出温度T在一个恒定参考值TR上.参考值在控制术语中指的是给定值. 下面我们考虑两个问题.把加热搅拌器内的液体从输入温度Ti加热到输出温度TR,需要多少热量?1.要确定达到设计运行条件下的热量需求,我们需要写下槽内液体的稳定能量平衡式. 在写平衡式之前,假设槽内是完美搅拌的,同时忽略热损耗.2.在这些条件下,槽内成分的温度保持一致,因此,输出温度等于槽内液体温度..3.分别表示Ti, T, w, 和 QC 是液体的比热. 我们假设C是恒定的. 在设计条件下,将其代入方程(1),1.方程(2)是加热器的设计方程.如果我们的假设是正确的,同时输入流量和输入温度等于他们的标定值,那么有方程(2)给出的输入热量将使输出温度保持在期望值TR.但是,如果给定条件变化,会产生什么样的结果呢?这给我们带来第二个问题:2.问题2. 假设输入温度Ti随时间变化. 我们如何确保温度T保持或靠近给定值TR?最为一个特殊的例子,假设Ti增加到一个大于的值. 如果Q保持在标定值上恒定,我们可以得到输出温度将增加,因此T>TR.为应付这种情况,有一些可能的策略控制出口温度T方法1。
机械设计制造及其自动化专业英语第三版第二章课后答案1、Location is the first thing customers consider when_____to buy a house. [单选题] *A.planning(正确答案)B.plannedC.having plannedD.to plan2、It was _____the policeman came_____the parents knew what had happened to their son. [单选题] *A.before…asB. until…whenC. not until…that(正确答案)D.until…that3、A?pen _______ writing. [单选题] *A. is used toB. used toC. is used for(正确答案)D. used for4、It is reported()three people were badly injured in the traffic accident. [单选题] *A. whichB. that(正确答案)C.whileD.what5、It _____ us a lot of time to do this job. [单选题] *A. spentB. madeC. took(正确答案)D. cost6、78.—Welcome to China. I hope you'll enjoy the ________.—Thank you. [单选题] * A.tour(正确答案)B.sizeC.nameD.colour7、As I know, his salary as a doctor is much higher_____. [单选题] *A. than that of a teacher(正确答案)B. than a teacherC. to that of a teacherD. to a teacher8、It’s raining outside. Take an _______ with you. [单选题] *A. cashB. life ringC. cameraD. umbrella(正确答案)9、In order to find the missing child, villagers _______ all they can over the past five hours. [单选题] *A. didB. doC. had doneD. have been doing(正确答案)10、He often comes to work early and he is _______ late for work. [单选题] *A. usuallyB. never(正确答案)C. oftenD. sometimes11、Do not _______ me to help you unless you work harder. [单选题] *A. expect(正确答案)B. hopeC. dependD. think12、She talks too much; you’ll be glad when you’re free of her. [单选题] *A. 与她自由交谈B. 离开她(正确答案)C. 受她的控制D. 与她在一起13、We have ______ homework today. ()[单选题] *A. too manyB. too much(正确答案)C. much tooD. very much14、( ) What she is worried __ is ____ her daughter is always addicted to chatting online./; that [单选题] *A /; thatB of thatC about that(正确答案)D about what15、The students in that university are not fewer than()in our university. [单选题] *A. the oneB. thatC. themD. those(正确答案)16、Kate has a cat _______ Mimi. [单选题] *A. called(正确答案)B. callC. to callD. calling17、There was a time()I wondered why I would like to do this boring job. [单选题] *A. whichB. whyC. whereD. when(正确答案)18、Do you know what()the change in his attitude? [单选题] *A. got throughB. brought about(正确答案)C. turned intoD. resulted from19、_______ your parents at home last week? [单选题] *A. IsB. WasC. AreD. Were(正确答案)20、The early Americans wanted the King to respect their rights. [单选题] *A. 统治B. 满足C. 尊重(正确答案)D. 知道21、一Mary wants to invite you to see the movie today. 一I would rather she(B)me tomorrow. [单选题] *A.tellsB. told (正确答案)C. would tellD. had told22、We’re proud that China _______ stronger and stronger these years. [单选题] *A. will becomeB. becameC. is becoming(正确答案)D. was becoming23、The relationship between employers and employees has been studied(). [单选题] *A. originallyB. extremelyC. violentlyD. intensively(正确答案)24、The young man had decided to give up the chance of studying abroad, _____ surprised his parents a lot. [单选题] *A. whenB. whereC. which(正确答案)D. that25、The children are playing wildly and making a lot of?_______. [单选题] *A. cryB. voicesC. noises(正确答案)D. music26、_____from far away, the 600-meter tower is stretching into the sky. [单选题] *A. SeeB. SeeingC. To seeD. Seen(正确答案)27、—What do you think of Animal World? —______. I watch it every day.()[单选题] *A. I don’t mind it.B. I like it.(正确答案)C. I can’t stand it.D. I don’t like it.28、I hope to see you again _______. [单选题] *A. long long agoB. long beforeC. before long(正确答案)D. long29、Chinese is one of ____ most widely used languages in ____ world. [单选题] *A. a, theB. /, theC. the, the(正确答案)D. a, /30、In winter, animals have a hard time_____anything to eat. [单选题] *A.to findB.finding(正确答案)C.foundD.to finding。
反馈是什么,有什么影响?第(1)中的例子所示,使用反馈的动机,是有些简单化。
在这些例子中,示出使用反馈的目的是减少参考输入和系统输出之间的误差。
然而,意义反馈控制系统的影响是复杂的,比这些简单的证明的例子。
系统误差的减少仅仅是许多重要的作用,其中一个反馈可以具有一个系统时。
我们在下面的章节的反馈意见也表明对这样的系统的性能稳定性,带宽,整体的特性增益,干扰和灵敏度。
要了解反馈控制系统的影响,至关重要的是,我们研究这个现象米广义的。
当反馈,特意推出了为宗旨,控制,很容易发现它的存在。
Howe.er,有许多情况,其中一个物理系统,我们通常承认了固有的非反馈系统运行有反馈时,观察到以某种方式。
在一般情况下,我们可以说,每当一个封闭反馈是系统变量序列之间存在的原因和结果的关系所述存在。
在大量的系统的观点将不可避免地承认反馈通常会被认定为无反馈系统。
然而,用的可用性反馈和控制系统理论,一般定义的反馈,使众多系统,带或不带物理反馈,进行研究以系统的方式,一旦存在在这个意义上的反馈前面提到的建立。
现在,我们将研究的各个方面的系统的效果的反馈性能。
没有必要的线性系统理论的数学基础,在此一点上,我们只能依靠简单的静态系统符号,为我们的讨论。
让我们考虑一下在图1所示的简单的反馈系统配置。
2。
1的方法,其中,r是输入信号。
y的输出信号,e是错误的,和B的反馈信号。
参数G和H可以被认为为不断增长。
通过简单的代数运算,它是简单的输入输出系统的关系,是使用这个基本的反馈系统结构的关系,我们可以发现一些反馈的显着影响。
1.2.1总增益效果的反馈可以看出式。
(1.2.1)。
反馈影响非反馈系统的增益C的由一个系数1 + GH与图1的系统。
2。
1是说,有负反馈,因为减号分配到的反馈信号。
的数量GH本身可能包括一个减号,所以一般的反馈的效果是,可能会增加或减少在一个实际的控制系统的增益G。
ĝ和H是频率的函数,S的大小可以是大于1的1 + GH在一个的频率范围内,但小于1英寸另一个。
第1章工业过程控制原理近年来,工艺装置的性能要求已变得越来越难以满足。
更激烈的竞争,更加严格的环保和安全法规和瞬息万变的经济环境已经在收紧厂的产品质量标准的关键因素。
更复杂的是,现代化的进程变得更加难以操作,因为更大,更高度集成的植物更小的浪涌能力之间的各种处理单元的趋势。
这些植物给运营商很少有机会能防止翻倒从一台设备传输到其他互联单位。
鉴于放置在安全的越来越重视。
高效的工厂运营,这是很自然的主题,过程控制,在最近几年变得越来越重要。
事实上,在没有过程控制中,就成了不能够操作最现代化过程安全,有益,同时满足植物的质量标准。
1.1.1举例说明作为一个引进的过程控制。
考虑在图所示的连续搅拌槽加热器。
1。
1。
1的进气口的液体流具有的质量流量w和温度T。
搅拌罐内容,并提供问答瓦的电加热器加热。
据推测,在入口和出口的流率是相同的,液体密度p保持恒定的,即是在温度变化足够小,可以忽略不计的温度依赖性的p。
在这些条件下,液体在槽中的体积V保持恒定。
搅拌罐的加热器的控制目标是保持的出口温度T在恒定的参考值TR。
的基准值被称为对照术语作为设定点。
接下来,我们考虑两个问题。
问题1。
多少热量必须被供给到搅拌槽加热器加热的液体从入口温度T,的出口温度TR?要确定所需的热量输入,为设计工况条件下,我们需要写一个稳态能量平衡的液体在槽中。
在写这种平衡,它假定罐被完全混合,听到的损失是可以忽略不计。
在这些条件下有制作人:中国石油大学(华东)信控学院xueyue内的排名的内容是没有温度梯度,因此,出口温度是罐中的液体的温度相等。
甲稳态能量平衡罐表明添加的热等于焓变化之间在入口和出口流:Q = WC(T-Ti)的(1)其中,Ti的Tw和Q表示体的Tw和Q的额定稳态设计值。
和C是比热的液体。
我们假设,C为常数。
在设计条件下,T = TR(设定点)。
这种替代式。
(1)给出的表达式{或标称输入热量Q = WC(TR-T)(2)方程(2)是对听者的设计方程。
控制器整定1。
某化工厂中经常遇到的过程控制系统是什么?2。
控制系统在安装后,必须调整什么?3。
什么样的方法经常被用来调整控制器吗?4。
能否请您给的典型方法和步骤?后安装一个控制系统控制器的设置,通常必须进行调整,直到控制系统的性能被认为是令人满意的。
此活动被称为控制器的控制器整定或现场调谐。
由于控制器整定的操作通常是通过试验和错误的,它可以是相当乏味和费时的。
因此,它是希望的令人满意的控制器设置有良好的初步估计。
一个良好的第一猜测可能是类似的控制回路的经验。
或者,如果一个过程模型或频率响应的数据是可用的,一些特殊的设计方法可以被利用来计算控制器设置。
然而,现场调整可能仍然需要精神符控制器,特别是如果可用的进程信息是不完整的,或者不是很准确选择控制器的类型(P,PI.etc)的设置和选择的一般准则是经常遇到的过程变量:流量,液位。
气体的压力,温度,和组合物。
该指导方针将讨论的过程模型是不可用的情况下是有用的。
然而,他们应谨慎使用,因为异常发生类似的准则是选择初始控制器设置为启动一个新的工厂。
流量控制流量和液体的压力控制回路,其特征在于由快速响应(在顺序秒),与基本上没有时间延迟的pfo.ess动力学由于可压缩性(在气流中)或惯性的影响(在液体中)。
如果使用了气动工具的传感器和信号传输线可能会带来显着的动态滞后。
流量控制系统中的干扰往往是频繁的幅度很大,但一般不会干扰因素是高频噪声(定期或随机)由于流湍流,阀的变化,泵的振动。
PI流量控制器通常使用与中间值的控制器增益Kc。
存在的重复高频率的噪音排除使用衍生诉讼。
液位一个典型的非自调节液位过程中已经讨论过,因为它的集成性。
一个datively高增益控制器可用于控制系统的不稳定性的关注不大。
事实上,控制器增益的增加往往会带来系统中的稳定性增加。
而低的控制器的增益可以增加振荡积分控制动作的程度,通常使用牙钻是不必要的,如果在液体中的电平(±5%)的小的偏移量可以容忍的微分作用还没有电平控制中通常采用的,因为水平的测量常常包含产生的噪声,plashing和动荡的液体进入储罐。
UNIT 1ElectricalNetworksA电路An electrical circuit or network is posed ofelements such as resistors, inductors, and capacitors connected togetherin some manner、If th e network contains noenergysources,such as batteries or electrical g enerators, it is known as a passive network、On the other hand, if one or more energy sources are present, the resultant bination is an activenetwork、In st udying the behavior of an electrical network, we areinterested in determining the voltages and currents that exist within the circuit、Since a network is posed of passivecircuit elements,we must first define the electrical characteristics of these elements、电路或电网络由以某种方式连接得电阻器、电感器与电容器等元件组成。
如果网络不包含能源,如电池或发电机,那么就被称作无源网络。
换句话说,如果存在一个或多个能源,那么组合得结果为有源网络.在研究电网络得特性时,我们感兴趣得就是确定电路中得电压与电流。
因为网络由无源电路元件组成,所以必须首先定义这些元件得电特性、In the case ofa resistor, the voltage-currentrelationship is given by Ohm's l aw, which states that the voltage across the resistor is equalto the current through the resistor multiplied by the value of the resistance、Mathematically,this is expressed as就电阻来说,电压—电流得关系由欧姆定律给出,欧姆定律指出:电阻两端得电压等于电阻上流过得电流乘以电阻值。