Unit 3 Computers

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Unit 3 Computers
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Warming up
monitor
screen
host computer
speaker
keyboard
mouse
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What do they have in common?
A calculator
An abacus
A desktop
A notebook computer
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digital camera
a laptop
palmtop
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Whats next?
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An abacus ??
An abacus is an old calculating machine used in
China until now.
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Calculator ???
A calculator is a new calculating machine
which can solve a large number of mathematical
problems.
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A huge computer
A huge computer is built to solve some
mathematical problems. But it is too big.
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PC personal computer
A PC is a personal computer which can
solve all kinds of problems and is used widely
now.
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Notebook computer
A notebook computer is a kind of useful
computer which can be taken conveniently like a
notebook.
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(What do they have in common?)
Discussion
1.They can be used for calculating. 2.They can
deal with maths problems. 3.They are useful
and helpful.

• I think that
• In my opinion
• I believe that
• Whats your reason?
• Why do you think so?

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The history of computers
the second generation (1956-1963)
The first generation (1945-1956)
the fourth generation (1971- )
the third generation (1964-1971)
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Speak the following on the whole

1. What is PC?

It means personal computer.
2. What is IT?
Information Technology.
3. What is CD-ROM?
Compact disc read-only memory.
4. What is PDA?
Personal digital assistant.
5. What is W.W.W?
World wide web.
6. ????
Science and technology.
7. ????
Artificial intelligence.
Notebook computer.
8.?????
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9. Who was the first person to devise the
first computer?
Charles Babbage invented an analytical
machine in 1822.
10. Who was the computers real father?
Alan Turing.
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Other useful words and expressions about computer
network website program virus hacker
software hardware
upload download home page password desk top
user name click
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