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English for Engineering

Meeting people

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Complete these dialogues with words in the box.

all is meet names nice this

too you welcome whats

N: Hi, my (1)___ Nat.

K: Pleased to (2)___ you. Im

Khal.

N: Pleased to meet you, (3)___.

P: Good morning. (4)___ your

name?

A: Im Ari. And (5)___ are?

P: My names Phil. (6)___ to

meet you.

Tim: Hi, everybody, (7)___ is Pin.

All: Hi, Pin!

Tim: Pin, this (8)___ Akh, and Lin.

Pin: Nice meeting you (9)___.

Lin: Likewise.

Tim:(10)___ to the team and

good luck.

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1. Complete this email with am, is, are, their, our, or

my.

2. Write a reply to the email. Introduce your self.

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Language focus

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Language focus

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Write three sentences about yourself and your daily schedule.

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Reading Unit 1

ELECTRICAL CLASIFICATION OF ALL

MATERIALS

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Pre-reading (1)

What does these terms mean to you?

Conductor

Insulator

Semiconductor

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Pre-reading (2)

Mention some things belonging to conductor

or insulator from your surrounding!

Describe briefly the use of the things you have

mentioned above!

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Read the text carefully

Conductors, Insulators, and Semiconductors

If we connect a battery across a body, there is amovement of free electrons towards the positive end.This movement of electrons is an electric current. Allmaterials can be classified into three groups according

to how readily they permit an electric current to flow.These are: conductors, insulators, and semiconductors.

In the first category are substances which providean easy path for an electric current. All metals areconductors; however some metals do not conduct well.

Manganin, for example is a poor conductor. Copper is agood conductor, therefore it is widely used for cables.A non-metal which conducts well is carbon. Salt wateris an example of a liquid conductor.

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A material which does not easily release electrons iscalled an insulator. Rubber, nylon, porcelain and air are allinsulators. There are no perfect insulators. All insulators willallow some flow of electrons; however this can usually beignored because the flow they permit is so small.

Semiconductors are midway between conductors andinsulators. Under certain conditions they allow a current toflow easily but under others they behave as insulators.Germanium and silicon are semiconductors. Mixtures ofcertain metallic oxides also act as semiconductors. These

are known as thermistors. The resistance of thermistorsfalls rapidly as their temperature rises. They are thereforeused in temperature-sensing device.

(Glendinning, 1980:1)

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What do the pronouns in italics in these

sentences refer to? All materials can be classified into three groups

according to how readily theypermit an electriccurrent to flow.

Under certain conditions theyallow a current to floweasily but under others they behave as insulators.

These are known as thermistors.

Theyare therefore used in temperature-sensingdevice.

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WritingLink the following pairs of ideas using suitable connective because or therefore.

Example:

a. Copper is used for cables.

b. Cooper is a good conductor.

a + b = Copper is used for cables because it is a good conductor.

a. The flow of electrons through insulator is very small.b. The flow can be ignored.

a + b = The flow of electrons through insulator is very small,

therefore it can be ignored.

It is easy to control the speed of dc motors.

DC motors are used when variable speeds are required.

Soft iron is used in electromagnets.

Soft iron can be magnetized easily.

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A cathode-ray tube screen glows when an electron beam strikes it.

The screen is coated with phosphor.

Transistors can be damaged by heat.

Care must be taken when soldering transistors.

PVC is good to cover cables.VC is a good insulator.

The voltage is 250 V and the current is 5 A.

The resistance is 50 .

PVC is good to cover cables.

PVC is a good insulator. The voltage is 250 V and the current is 5 A.

The resistance is 50 .

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Speaking

Discuss with your fiend(s) the benefit of conductor, insulator

and semiconductor in our daily life. Use the following expressions in your discussion.

1. What about___________________________________________________

2. What do you think of____________________________________________

3. Whats your opinion____________________________________________

4. Im of the opinion______________________________________________

5. As I know____________________________________________________

6. In my view___________________________________________________

7. I think_______________________________________________________

The following view points may guide and focus your

discussion. Household appliances using conductor, insulator and/or

semiconductor

Industrial apparatus using conductor, insulator and/or semiconductor

Educational aids using conductor, insulator and/or semiconductor

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Thank you