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COMPUTER
COMPUTER : IS an electronicdevice that is used to input ,process and output and retrieve data
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Computer are machines that perfom s task or calculating according to a set of instructions or
programme
Computer is a programmable machine
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Input : key of data
Output : viewed of data that has been keyed in
Retrieve : making the data which was saved accessible
Internet : inconnection of computer globaly
Browser a software a applation for retrieving presenting and tracer sign informationresources on the
world wide web e
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A computer is bmade up of the following devices
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Keyboard
Mouse system unit
Monitor
Scanner
Video camera
Speaker
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Opening a computer /booting up a vcomputer
Procedure
Switch on the power of the main switch
Press the power button on system unit
Press the power button on system monitor
main componets /devices
Switching off computer
Procedure
Clickn on start button
Point to shut down
Press the button on the monitor
Swith off on the socket /main switch /extensions
Various functions of the keyboard
Key symbols
explanations
Windows
pc keyboards have a window key which looks like a four pane window
Command
apple mac computers have a command key
Esc
esc (escape key)
F1 –f12
information about f1 thru f12 keyboard keys
F13-f24
information about f13 through f24 keyboard key
Tab
tab key
Caps lock key
change to capital or small letters
Shift
shift key
Ctrl
ctrl (control) key
Alt
alt (altanate ) key ( pc only mac users have option
Space bar
space bar key
Arrows
up down left right arrows keys
Backspace
back space key
Delete
delete key
Enter
enter key
Pit sern
print screen key
Scrool bar
scroll bar key
Pause
pause key
Break
break key
Insert
insert key
Home
home key
Page up
page up or up key
Page down
page down or page down key
End
end key
Number lock
num lock key
Computer hardware
Input device
Output device
Storage
Also are divided into hardware and software
Computer hardware
Hardware are physical part of computer that you can be able to feel and touch
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Hardware includes input devices ,output devices ,system devices ,without these componets that’s allow you
to the user to enter data into the computer
These are many inputs six of the most widely used input devices
A KEYBOARD you can use the keyboard to type the
letters and numbers and symbols into computers
Mouse it’s a pointing device that has a pointer that chages
into different shapes as you use the mouse you click into
different shapes as you use the mouse by pressing
releasing the button this action allows you to enter date
when using a mouse
A scanner this input devices : this input device copies from
paper into your computer
A microphone this is ussualy used for voice input into the computer
A digital camera this camera allows you to take pictures that you can input ito your computer
Ape video camera this pc video camera allows you to take both video and still image that you
can input into your computer
Output devices an output device is any hardware computer component that gives information
to the users
Three commonly used output devices are as follow
A monitor : this output device displayers your information on screen
A speaker sound is the typee of output you will get from a speaker
Cd and dvd these type of storage media hold much more information than a floppy disk they are
also considered portable storage of these types of storage media come in different forms
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Flash drive: this is storage medium that is very easy to carry around and it also holds more data
than a floppy disk
Asyou can see from the picture below it is very small compared with the others
Hard drives
A printer : this is output device prints information on paper