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By De Rosa Carmine, Amara Faten and Ould Ali Omar (complete version, requires download)

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By De Rosa Carmine, Amara Faten and Ould Ali Omar

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By Corradi, Gherardi, Rauso

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Types of computer, computer system and input_output devices

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By Corradi, Gherardi, Rauso

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First Paragraph:

A computer is a combination of hardware and software. hardware refers to all the pieces of equipment that you can see and touch,
for example the keyboard,the screen,the case,the mhoterboard,the power supply,the cooling system,ram,hard disc,the graphic card and the most important of all
the central processing unit(CPU), a microprocessor which functions as the computer's brain controlling all its action.Software
refers to all programs which tell the hardware what to do.The main software is the Operationg System,that manages hardware and software resources.The driver
is the set of software procedures, often written in assembly, which allows an operating system to drive a hardware device.The Operating System can be
configure and update to make devices or programs better and able to do more things and also have the possibility of doing back up to stored and holds data.
The computers can be in all shapes and sizes, from a tiny embedded computer, that are insert for exampole in poket calculators,
car engines,videogame consoles, to a gigantic mainframe computer that are large powerful supercomputers,with thousands of linked microprocessors, 
used by governments and research institutions to carry out highly complex calculations. We use personal computer,the most used, that is designed 
to be used by one person at a time.


Second Paragraph:
The hardware can be divided into four groups:
	1. Input--> Computer takes in data through keyboard and mouse
	2.Procesisng--> Computer processes the data according to the instructions in the programs through CPU
	3.Output-->Computer shows the results of this processing to the user, through screen or printer.
	4.Storing-->Computer stores these results in its memory,the hard disc, that holds data taht can be used again in the future.

All components of hardware are interlinked through a comunication network calls bus. the centre of comunications is the motherboard, the computer's main
circuit board that is controlled by CPU.The latter(quest'ultimo)has double function: 
	1.it processes data which the user feeds into the computer.
	2.it controls the operations of all other component 
The speed of a CPU,called clock speed, is measured in heartz,cycles per second,with each cycle representing one operation, for example a cpu with 4 GHz
can perform 4 bilion operations every second.

Third paragraph:

Input devices:
	1.Keyboard-->this device includes keys to perform special tasks and keys to control the movement of the cursor on the screen
	2.mouse-->through the movement of this device the user can direct the movement of the cursor on the screen and give instructions by selecting icons 
	on the screen and clicking on a button
	3.microphone-->this device convert sound waves into electronic signals which can be read by the computer and stored in its memory.
	4.touchscreen-->this device enables the user to activate the computer by using a finger to touch symbols or words shown on the screen
	5.touchpad-->by moving a finger around a small area of sensitive plastic, the user can control the movement of the cursor on the screen,selected icons
	and give instructions by clicking on a button.
	6.joystick-->the user can move this device in differents directions and the movement is translated into corresponding signals to be shown on a screen
	or to control the actions of a robot.
	7.scanner-->this device digitises photographs and other illustrations by ligth sensors, translating them into numerical form for processing by computer

Output devices:
 	1.monitor-->this device is a screen panel with a display based on liquid crystal technology
	2.printer-->This device produces output on paper and can be inkjet,sprayng liquid ink,or laser,using a dry ink called toner.
	3.speakers-->this device transforms digital signals into sound waves which can be heard by the user.
	4.modem-->this device enables communication etween computers over thelephone lines by converting digital data into thelephone signals and vice versa.

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Computers of the future: The age of quantum computers

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Computers of the future: The age of quantum computers

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How computers evolved - Standing on the shoulders of giants

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How computers evolved - Standing on the shoulders of giants

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 Making your password secure - digital safety

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 Making your password secure - digital safety

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Upgrading hardware - Describing a computer - Solving printer problems;

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Upgrading hardware - Describing a computer - Solving printer problems;

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Computer storage: Internal memory, methods of storage - Computer ports and connections

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Computer storage: Internal memory, methods of storage - Computer ports and connections

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Types of computer - The computer system - input / output devices

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Types of computer - The computer system - input / output devices