Transcript Components of a Computer

Sara Naheed Amjad
201202564
Information Technology
Computer & it’s components
Outline
• What is computer ?
 Data & Collection
 Information Processing Cycle
 Machine Cycle
• 5 Computer Components






Input
Output
System Unit
Storage Device
Storage Media
Communication Device
Computer
What is a Computer ?
• A computer is an electronic
device, operating under the
control of instructions stored
in its own memory
Computer process Data into
information
Data :
it is a collection of unprocessed items,
which can include text, numbers, images,
audio and video
Information :
It conveys meaning and is useful to
people
Computer
Process
Data
Accept Data
Produce
Results
Store the
results
Information Processing Cycle
 Computer process data (input) processes
it (process) using information (output).
Computer holds data information and
instructions (storage ). Most computers
communicate with other computer
(communication)
Components of a Computer
• A computer contains many electric,
electronic and mechanical components
known as hardware. This components
include:
 Input Device
 Output Device
 System Unit
 Storage Device
 Storage Media
 Communications Device
Components of a computer
Input Device
• An input device allows you to enter
data or instructions into a computer
Examples of input device
 Keyboard
 Mouse
 Microphone
 Scanner
 Webcam
Examples of input device
Components of a computer
Output Device
• An output device is any hardware
component that conveys information to
one or more people. Three most
common used output device are :
1. Printer
2. Monitor
3. Speakers
Examples of output device
Monitor
Printer
Speakers
Components of a computer
System Unit
• The System unit is a case that contains the
electronic components of the computer that
are used to process data
• A system unit includes a board called
motherboard
A mother board contains two component
known as:
 Processor
 Memory
Processor
• Processor is also called a
CPU (Central Processing Unit)
, it is the electronic
component that interprets and
carries out the basic
instruction that operate the
computer
Memory
• It consists of electronic
components that store
instructions waiting to be
executed and data needed by
those instruction
Components of a computer
Storage Devices
• Storage holds data, instructions
and information for future use
Storage Media
• A computer
keeps data,
instructions
and
information on
storage media
Storage Device
• A storage
device records
and reads items
to and from
storage media
Examples
• Storage Device
 DVD Drive
 CD ROM
 Memory card Drive
• Storage Media
 USB
 Hard Disk
 Memory cards
Components of a computer
Communication Device
• A communication device enables a
computer to send and receive data,
instructions and information to and from one
or more computer or mobile devices
• Example of Communication
Device is Modem
Machine Cycle
Set of four basic operations :
• Fetching: it is the process of obtaining
a program instruction or data item from
memory
• Decoding: used to translate the
instructions into signals the computer can
execute
• Executing: it is the process of carrying
out the command
• Storing: writing the result to memory
References
 http://en.wikipedia.org/wiki/File:Linksys_ADSL_Mod
em_AM300.jpg
 http://ah-newelectronic.blogspot.com/2011/01/lg-
hyun-kim-data-storage-device.html
 http://www.tigerdirect.com/applications/category/cat
egory_tlc.asp?CatId=9&name=Keyboards%20/%20Mic
e%20/%20Input