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7.Answer the questions on the text.

1) What is X10 and what does it do?

2) What does a numerical code consist of?

3) What is the limitation of X10?

4) What other technologies besides X10 are used by home automation networks?

5) What are the differences between Z-Wave and ZigBee?

6) How does Insteon work?

Language Study. Reduced time clauses

Study these two actions:

1. Ground waves pass over sand.

2. Ground waves lose energy.

We can link these actions to make one sentence, using a time clause:

When ground waves pass over sand, they lose energy.

Because the subject of both actions is the same – ground waves – there is a shorter method we can use to link the actions:

When passing over sand, ground waves lose energy.

When + -ing shows that Action 2 happens during the same period as Action 1.

Now study these two actions:

1. The sky wave strikes the earth.

2. The sky wave bounces back again.

Again we can link these actions to make one sentence, using a time clause:

When the sky wave strikes the earth, it bounces back again.

We can also link the actions in a shorter way:

On striking the earth, the sky wave bounces back again.

On + -ing shows that Action 2 follows immediately after Action 1.

9. Link these pairs of actions. Use short ways when this is possible.

1.

2.

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The switch is closed.

Current flows through the primary of the transformer.

The radar signal strikes a plane.

The radar signal is reflected.

A cell discharges quickly.

A cell may become hot.

The TV receives signals from the remote control.

The TV follows your instructions.

The radar receiver receives the reflected signal.

The signal is compared with the transmitted signal.

You choose a course in electronics.

You think carefully about your future.

Microwave signals strike a high building.

Microwave signals are deflected.

You make a recording.

You should ensure the recording levels are satisfactory.

The alarm detects an intruder.

The alarm triggers an audible warning.

The remote control button is pressed.

The television set changes channel.

APPENDIX.

LESSON 1. A FULL-TIME STUDENT.

I = Interviewer, M = Matthew

The Interviewer and the Full-time Student

I:

M:

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M: I: M:

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I:

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Can I ask how old you are?

Nineteen.

And what’s the name of the course you are taking?

It’s a National Certificate in Information Technology.

Is that a full-time or a day release course?

Full-time.

And how long does it last?

A year. It finishes at the end of June.

How many students are in your class?

Twelve.

So it’s a small group.

Yes, but we started off with twenty but some dropped out.

Why was that?

Some found it a bit tough at the beginning of the course, especially the Maths. Others found jobs.

What subjects are you studying in this block?

Electrical Principles, Digital and Analogue Electronics. These are first things in the morning. Then we have got Communications.

I guess that’s language. Is it English?

Yes. We get it on a Monday and Wednesday after the coffee break.

What’s PSD – on Tuesday at 10.45?

Personal and Social Development. It’s job-seeking skills, techniques for interviews. For the last four weeks we have been having mock interviews, getting videoed.

You have got Computing on Thursdays and Fridays before lunch. Is that programming?

Yes, we are learning Pascal. We are doing machine code, too.

Does it look like English?

No, it’s all numbers.

And you have got Mathematics also, of course.

Yes, Calculus just now.

What’s CAD on Tuesday afternoon?

Computer-aided design.

What sort of things do you do?

Design circuits on it.

What subjects do you enjoy most?

Probably Principles, Maths, most of the electronic ones. I am not keen on Communications. All these words… It is not my scene.

I see ‘Practical’ here on a Wednesday afternoon. Is that when you assemble circuits, for example.

Yes.

What sort of things have you made?

A function generator1, an oscillator2

And is your course assessed partially on the practical side?

Yes, I get marks for that.

Now, you have got a very full week. That’s from 8.45 through to 4.30. And it’s a five-day week. Do they give you any time off for sports?

No, but we can use the indoor stadium – there’s basketball, football, everything. It’s quite hard to get in, though. They are very strict. You have got to wear the right shoes. And you have got to have enough people to make two teams.

What about hobbies?

I build my own bikes, but I haven’t got a license.

A slight inconvenience.

A function generator1 is an electronic device for producing various types of output signals which can be used for the test and measurement of amplifiers.

An oscillator2 is an electronic circuit which produces a repeating signal.

LESSON 2.

Describing the diagram.

Fig. 3 shows the block diagram of an amplitude-modulated (AM) radio transmitter. It consists of a radio frequency (RF) oscillator, a modulator, an audio frequency (AF) amplifier, and an RF power amplifier. The RF oscillator generates an RF carrier wave which is fed into the modulator.

The microphone converts sounds into audio frequency signals which are amplified by the AF amplifier. The modulator then uses the amplified AF signal to modulate the RF carrier wave.

The power of the modulated carrier wave is increased by the RF power amplifier. The strong modulated output signals are fed to the aerial which enables them to be transmitted over long distances.

LESSON 8. A SOUND ENGINEER.

LESSON 12. A WEBPAGE CREATOR.

I = Interviewer, J = John