Transcript presentation source

What is a Computer?
An electronic device, operating under
the control of instructions stored in its
memory unit, that can accept data
(input), process data arithmetically
and logically, produce results (output),
and store the results for future use.
What does a computer do?
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Can perform four general operations:
Input data (numbers, words, images, and
sound)
Process data (using software or computer
program)
Output (printed report, display)
Storage
What are the components of a
Computer?
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Input Devices
System Unit
Output Devices
Storage Devices
Input Devices
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The Keyboard
Mouse (pointing device)
disk drives
Monitor
Modems, scanners, digital cameras
Output Devices
• Printers
• Monitor
• disk drives
Storage Devices
• Floppy diskette
• Hard disk
• CD-ROM
Why is a Computer So
Powerful?
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Speed
Reliability
Accuracy
Storage
Communications
Computer Software
• System Software
Programs that are related to controlling the
actual operations of the computer.
• User Interface
Controls how information is presented on the
screen and how you enter data and commands.
• Application Software
Programs that tell a computer how to produce
information
Operating systems
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MS-DOS
Windows 3.x, 95, 98
OS/2
UNIX/ Linux
Windows NT
Application Software
• Word processors (used to create and print
documents)
We will be able to insert and delete text,
correct mistakes, move text, and perform
numerous other functions
• Spreadsheets:
Store numeric data which can then be used
in calculations
Automatically updates the calculations
should the data it stores be changed
• Databases:
store and manipulate large quantities of
data using the computer
• Presentation software
Combine text and graphics to create
professional looking material to use in a
presentation