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HITEC UNIVERSITY TAXILA
ELECTRICAL ENGINEERING
Presented by
MUDASSIR MUKHTAR
1Introduction to Computers
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Introduction to
Computers
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The Computer Defined
Electronic device
Converts data into information
Modern computers are digital Two digits combine to make data
Older computers were analog A range of values make data
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Parts of the Computer System
Hardware
Software
DataUser
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Parts of the Computer System
Hardware Mechanical devices in computer
Thing that can be touched
Software Tell the computer what to do
Also called the program
Thing that can not be touched
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Parts of the Computer System
Data Pieces of information
Computer organize and present data
User Most important part
People operating the computer
Tell the computer what to do
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Information Processing Cycle
Steps followed to process data Input
Processing
Output
storage
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Category of Computer Users
C omputers
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to Computers
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Different types of Computers
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Different types of Computers
Desktop computers
The most common type
of computer
Sits on desk or floor
Perform variety of task
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Different types of Computers
Notebook computers
Small portable
computers
Weight between 3 to 8pounds
About 8 by 11 inches
Typically as powerful as
desktop
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Different types of Computers
Tablet computers
Newest development in
portable computers
Input is through a pen
Run specialized versions
of office products
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Different types of Computers
Mainframes
Use in large
organizations
User access through aterminal
Handle thousand of
users
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Different types of Computers
Super computers
The most powerful
computers made
Handle large andcomplex calculations
Process trillions of
calculations per second
Found in researchorganizations
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Essential Computer Hardware
Memory
Stores data or program
Random Access Memory(RAM)o Volatile
o Stores current data or program
Read Only Memory(ROM)o Permanent storage of program
o Hold the computer boot system
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Essential Computer Hardware
Input or output devices
Allows the users to interact
Input devices accept datao Keyboardo mouse
Output devices deliver datao Monitor
o
Speakero printer
Some devices are input as well as outputo Touch screens
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Essential Computer Hardware
Storage devices
Hold data and program permanently
Different from RAM
Magnetic storageo Floppy an d hard drive
o Use magnetic to access data
Optical storageo CD and DVD hard driveso Use laser to access data
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THANK YOU!
18Introduction to Computers