电子与通信技术专业英语(第4版)Unit 2 lesson 9

Notes
5
…required cause a current of one ampere to pass through a conductor having a resistance of one ohm…
⑴过去分词required充当后置定语， 修饰electromotive force；⑵having a resistance of one ohm是现在分词短语， 充当后置定语，修饰conductor。
Chinese Translation of Texts
对电流的阻力叫电阻, 用字母符号R表示。电阻的单位是欧姆，常用Ω表示。1欧 姆的定义是：当加到导体上的电压为1伏特时，将导体中的电流限制为1安培所需的 电阻值。较大的电阻值常用千欧( kΩ )和兆欧（MΩ）表示。
Chinese Translation of Texts
The relationship between volts, amperes, and ohms can be represented by “ Ohm’s Law”. Ohm’s Law states that the ratio of the voltage between the ends of a wire and the current flowing in it is equal to the resistance of the wire. Now, we can say that when a given voltage is applied across the ends of the wire, an electric current always flows along it, and the value of this current depends on the resistance of wire (as shown in fig.2-1).

Text
New word
Notes
Exercises
Translation
Vocabulary
Notes:
PART
3.The general purpose oscilloscope is suitable for any of the usual applications in servicing communications, scientific, or industrial work where the frequency of the signal to be observed does not greatly exceed 500kHz. 译文：通用示波器适用于通信、科学研究、工业生产等各个领域，用来观察频率不超过500kHz以上的电子 信号。 “in”意为“在……方面”或“在……领域” 4.Horizontal sweep is a term referring to the action of the horizontal system causing the glowing dot to move across the screen. 译文：水平扫描是这样的术语，它指水平系统使光点沿水平方向扫过屏幕。 “term”意为“术语”，而“referring”是动词现在分词，作后置定语。
Lesson 8 The Oscilloscope
PART
One of the most important electronic test and measuring instruments is the oscilloscope. It is widely used in design work, trouble-shooting and signal monitoring, manufacturing and production-line testing, and many other applications where the observation of an electrical waveform is desired.

Computer simulation seems to be the only choice for analysing disasters, calamities and accidents. Quite a lot of impressive simulations have been made on some potentially threatening disasters and calamities, for example, the aftermaths of a global nuclear war, the disastrous effect on global climate and environment as a result of worldwide greenhouse effect, the probability of collision between an invading meteorite and the earth, etc.
New word
Notes
Exercises
Translation
Vocabulary
Lesson 20 Computer Simulation
PART
around it or the effect imposed on it. Sophisticated computer simulation package capable of providing real-time interactive moving images have emerged, although still beyond the reach of most industries. Meanwhile, many CAD systems have incorporated visual modules to enable engineers to interactively "walk" through their 3-D pseudo models on screen to review their designs and present them to their clients. This convenience is particularly important to architects.

b. is a passive electronic component that stores electric charge.
New word
Notes
Exercises
Translation
Vocabulary
Exercises:
PART
1. Write T(True) or F(False) beside the following statements about the text. a. One symbol represents a type of component. b. Resistors are damaged by heat when soldering. c. Capacitors are not often used in filter circuits. d. Both capacitor and inductor are passive electronic component. e. Inductor stores electric charge. f. Diodes allow electricity to flow either one direction. g. Diodes also are called valves. h. The symbol of NPN and PNP transistors is same. i. ICs are complex circuits which have been etched onto tiny chips of semiconductor. j. LEDs is one type of diodes.
e. field 5. It changes polarity periodically.