【英语口语对话场景20篇】英语口语对话稿

口语考试时间：13周上课时间要求：1 group work or individual work2 Talk about your major study 3 Use one or two st[db:cate]

口语考试时间：13周上课时间

要求：1. group work or individual work

2. Talk about your major study.

3. Use one or two strategies we have learned.

Guiding questions:

1. Introduce a term or theory in your major.

2. Compare and contrast two terms, theories, or branches about your major study.

3. Describe your favorite course and explain why.

4. Describe what you like and dislike about your major.

Strong electricity and week electricity

At first, I though that the strong electricity refers to the power with high voltage or high current. In fact, it is a wrong definition. In our major, the definition of the electricity is focus on the function. Strong electricity is used as a kind of power energy, but week electricity is used for information transfer.

According to the fundamental principle that weak electric conduct signal, strong electric conduct energy, we can easily distinguish heavy current from weak current. For example, although electric razor, flashlight get electricity from only two dry cells (3 v), but we can"t consider it as low voltage class because of using small electric voltage current the transmission is power rather than the signal, so it should belong to high voltage class

That means what we used in houses; the 220V electricity belongs to strong electricity. Then the audio lines, video lines, network lines and telephone lines belong to week electricity. Theses lines’ voltage usually less than 32 V. The signal input of the telephone, computer and TV are all in low voltage electricity equipment. In addition, the strong electricity lines shouldn’t be set with week electricity lines in a same pipe. Because strong electricity creates a heavy magnetic field which affects data transmission of the week electricity.

FREQUENCY

A important difference we should consider is the frequency of electricity. The frequency of strong electricity is usually 50 HZ, which we called “power frequency”. The industrial power frequency is widely used in industrial production and resident life. In comparison to strong electricity, week electricity always have high frequency or ultrahigh frequency. That is because higher the current frequency is, can carry more information.

Transmission Mode

Here are the second main differences between strong electricity and week electricity. As we can see strong electricity transmit by transmission line. Unlike strong electricity, week electricity has more methods to be transported. Like the wire transmission and wireless transmission. Radio is transmitted by electromagnetic waves.

Zhou: I’m ZhouKang.

Hai: I’m HaiYiChen. Today, We are going to talk about our major and some points of it.

Zhou: To be honest. I don’t know what automation is, although we have learned it for one year.

What about you?

Hai: Automation is that machines or systems can achieve our goals through automatic detection, information processing, analysis and judgment, manipulation and control without people or with few people.

Zhou: Yes. We have got it from our textbook, but what I really want to know is your opinion.

Hai: Ha, I’m just kidding for using the description from our textbook. As far as I’m concerned, Automation is a tool which can simplify human’s work, especially in the heavy work and the complicated work. Just like the lathe in the factories, we can programming and make the lathe products what we need.

Zhou: While talking about the specialty in our school, there is a special attribute should be applied to limit it.

Hai: Yeah, I know. The word is “electric”. Our major is electric automation exactly. In the teacher’s words, we are the electrical engineers. With the rapid development of computer science, electronic technology has more significance for automation.

Zhou: Well, when we talk about the electricity. There is a pair of interesting words: strong electricity and week electricity. For these two terms, you must have something to share with us.

Hai: Of course. At first, I though that the strong electricity refers to the power with high voltage or high current. In fact, it is a wrong definition. In our major, the definition of the electricity is focus on the function. Strong electricity is used as a kind of power energy, but week electricity is used for information transfer.

Zhou: Yes, that’s the point. According to the fundamental principle that weak electric conduct signal, strong electric conduct energy, we can easily distinguish strong current from weak current. For example, although flashlight get electricity from only two dry cells (3 v), but we can"t consider it as low voltage class because it needs small electric voltage, but the transmission is power rather than the signal. So it should belong to high voltage class

Hai: That means what we used in houses; the 220V electricity belongs to strong electricity. Then the audio lines, video lines, network lines and telephone lines belong to week electricity. These lines’ voltage usually less than 32 V.

Zhou: And in opposition to it. The input signal of the telephone, computer and TV are all in low voltage electricity equipment. By the way, when you are going to wiring in your house. The strong electricity lines shouldn’t be set with week electricity lines in a same pipe.

Hai: Yes, I heard about it. The strong electricity creates a heavy magnetic field which affects data transmission of the week electricity. In addition to functions, what different characteristics do these two kind of electricities have?

Zhou: A important difference we should consider is the frequency of electricity. The frequency of strong electricity is usually 50 HZ, which we called “power frequency”. The industrial power frequency is widely used in industrial production and resident life.

Hai: Oh yes, I remember that week electricity always have high frequency or ultrahigh frequency. That is because higher the current frequency is, can carry more information.

Zhou: That’s right! And here are the second main differences between strong electricity and week electricity. As we can see strong electricity transmit by transmission line. Unlike strong electricity, week electricity has more methods to be transported. Including the wire transmission and wireless transmission. For example, Radio is transmitted by electromagnetic waves.

一般区分原则是：强电的处理对象是能源（电力），其特点是电压高、电流大、功率大、频率低，主要考虑的问题是减少损耗、提高效率，弱电的处理对象主要是信息，即信息的传送和控制，其特点是电压低、电流小、功率小、频率高，主要考虑的是信息传送的效果问题，如信息传送的保真度、速度、广度、可靠性。它们大致有如下区别：

（2）传输方式不同

强电以输电线路传输，弱电的传输有有线与无线之分。无线电则以电磁波传输。

（3）功率、电压及电流大小不同

强电功率以KW（千瓦）、MW（兆瓦）计、电压以V（伏）、KV（千伏）计，电流以A（安）、kA（千安）计；弱电功率以W（瓦）、mW（毫瓦）计，电压以V（伏）、mV（毫伏）计，电流以mA（毫安）、uA（微安）计，因而其电路可以用印刷电路或集成电路构成。