欧姆电阻

PART 1 Electrical and Electronic Engineering Basics UNIT 1 A UNIT 2 A UNIT 3 A UNIT 4 A UNIT 5 A UNIT 6 A UNIT 7 A Electrical Networks ———————————— 3 B Three-phase Circuits The Operational Amplifier ——————————— 5 Logical Variables and Flip-flop —————————— 8 Power Semiconductor Devices —————————— 11 Types of DC Motors —————————————15 AC Machines ———————————————19 Electric Power System ————————————22 B Transistors B Binary Number System B Power Electronic Converters B Closed-loop Control of DC Drivers B Induction Motor Drive B Power System Automation PART 2 Control Theory UNIT 1 A B UNIT 2 A UNIT 3 A UNIT 4 A The World of Control ————————————27 Stability and the Time Response ————————— 30 The Root Locus ————————————— 32 The Transfer Function and the Laplace Transformation —————29 B Steady State————————————————— 31 B The Frequency Response Methods: Nyquist Diagrams ————— 33 The Frequency Response Methods: Bode Piots ————— 34 B Nonlinear Control System 37 UNIT 5 A Introduction to Modern Control Theory B B B PART 3 B B B State Equations Optimum Control Systems Artificial Neural Network Computer Control Technology 42 43 44 Fundamentals of Computer and Networks The Applications of Computers 46 40 38 UNIT 6 A Controllability, Observability, and Stability UNIT 7 A Conventional and Intelligent Control UNIT 1 A Computer Structure and Function UNIT 2 A Interfaces to External Signals and Devices UNIT 3 A PLC Overview PACs for Industrial Control, the Future of Control 1 UNIT 4 A Fundamentals of Single-chip Microcomputer 49 B B PART 4 B B B B PART 5 B B B B PART 6 Understanding DSP and Its Uses Embedded Systems Design Process Control 50 52 53 Fundamentals of Process Control UNIT 5 A A First Look at Embedded Systems UNIT 1 A A Process Control System UNIT 2 A Sensors and Transmitters Final Control Elements and Controllers PID Controllers and Other Controllers Control Panels Control Based on Network and Information Evolution of Control System Architecture Stability of NCSs with Network-induced Delay Virtual Manufacturing—A Growing Trend in Automation Enterprise Resources Planning and Beyond Synthetic Applications of Automatic Technology UNIT 3 A P Controllers and PI Controllers UNIT 4 A Indicating Instruments UNIT 1 A Automation Networking Application Areas UNIT 2 A Fundamental Issues in Networked Control Systems UNIT 3 A Fundamentals of the Database System UNIT 4 A Concepts of Computer Integrated Manufacturing UNIT 1 A Recent Advances and Future Trends in Electrical Machine Drivers B B B System Evolution in Intelligent Buildings A General Introduction to Pattern Recognition Electric Vehicles UNIT 2 A Industrial Robot UNIT 3 A Renewable Energy 2 UNIT 1 A

电路 电路或电网络由以某种方式连接的电阻器，电感器和电容器等元件组成。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，那么组合的结果为有源网络。在研究电网络的特性时，我们感兴趣的是确定电路中的电压和电流。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的电特性。就电阻来说，电压-电流的关系由欧姆定律给出，欧姆定律指出：电阻两端的电压等于电阻上流过的电流乘以电阻值。在数学上表达为： u=iR (1-1A-1)式中 u=电压，伏特；i =电流，安培；R =电阻，欧姆。纯电感电压由法拉第定律定义，法拉第定律指出：电感两端的电压正比于流过电感的电流随时间的变化率。因此可得到：U=Ldi/dt 式中 di/dt =电流变化率，安培/秒； L =感应系数，享利。电容两端建立的电压正比于电容两极板上积累的电荷 q 。因为电荷的积累可表示为电荷增量 dq 的和或积分，因此得到的等式为 u=，式中电容量 C 是与电压和电荷相关的比例常数。由定义可知，电流等于电荷随时间的变化率，可表示为 i = dq/dt。因此电荷增量 dq 等于电流乘以相应的时间增量，或 dq = i dt，那么等式(1-1A-3)可写为式中 C =电容量，法拉。

It is defined as the electrical resistance through a one-centimeter cube of insulating material and is expressed in ohm-centimeters.

体电阻率定义为边长1厘米的立方体绝缘材料的电阻，并表示为欧姆-厘米。

A megohmmeter,commonly known by the trade name MEGGER,is an instrument used to measure very high values of resistance.for example, it is used to measure the resistance of the insulation on circuit conductors and motor windings amdgohmmeter is designed to measure the resistance in megohms;one megohm is equal to one million ohms.

兆欧计是一种用来测量巨大电阻的仪器，通常用商标MEGGER代称（估计MEGGER牌的市场占有率很高）。例如，它被用于测量回路中导体和电动机线圈的绝缘电阻。兆欧计的设计测量单位是兆欧，相当于一百万欧姆。

And 21, then measure the resistance with the ohmmeter .

若要测量触点1的电阻，需要闭合通道1和21，然后利用欧姆表测量电阻

To measure the resistance of Contact 1, close both Chs. 1 and 21, then measure the resistance with the ohmmeter. To measure Contact 2, open Chs. 1 and 21, close Chs. 2 and 22, then measure the resistance again.

若要测量触点1的电阻，需要闭合通道1和21，然后利用欧姆表测量电阻；若要测量触点2，需要开路通道1和21，闭合通道2和22，然后再次测量电阻。

Check resistance of the ignite coil, Red and Purple wires; resistance must be less then 1 ohm.

检查点火线圈电阻红色和紫色线；电阻必须小于1欧姆。

Voice coil (10 Ohms resistive, approximately 18 Ohms above 1 kHz).

音圈（10欧姆的电阻大约18欧姆以上的1千赫兹）。

Definitions such as that of ohm,"a unit of electrical resistance equal to that of a conductor in which a current of one ampere is produced by a potential of one volt across its terminals," take on more human connotations when we think of how human contributions to the study of electricity are memorialized in them.

定义诸如欧姆，&电阻单位，等于一伏特电压加于导体两端在导体内部产生一安培电流之导体电阻&，当我们想到人们对电学做出的贡献是怎样在这之中得到纪念的时候，就带上了更多的人文内涵。

Definitions such as that of ohm,"a unit of electrical resistance equal to that of a conductor in which a current of one ampere is produced by a potential of one volt across its terminals," take on more human connotations when wethink of how human contributions to the study of electricity are memorialized in them.

定义诸如欧姆，&电阻单位，等于一伏特电压加于导体两端在导体内部产生一安培电流之导体电阻&，当我们想到人们对电学做出的贡献是怎样在这之中得到纪念的时候，就带上了更多的人文内涵。

Surface resistivity is defined as the electrical resistance of the surface of a material and is expressed in ohms (usually referred to as ohms per square).

表面电阻率定义为材料表面的电阻，并表示为欧姆。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。