This document discusses the components of a computer system. It describes the central processing unit (CPU) and how it processes data from input and output units. Input devices discussed include keyboards, mice, scanners, touch pads, light pens, and joysticks. Storage devices include primary memory (RAM) and secondary memory like hard disks, floppy disks, and ROM. Output devices allow the computer to communicate results and include printers, monitors, speakers, plotters, LCD projectors, and DLP projectors.

1. 1© 2004, Cisco Systems, Inc. All rights reserved.
PRESENTATION
FOR PC I
YOUR NAME

2. COMPUTER HARDWARE COMPONENTS

3. WHAT IS COMPUTER
Computer is an electronic
device that is
programmable, accept,
store, and retrieve data or
information.
A device that can perform
arithmetic calculation and
logical operation.

4. The Computer Continuum 3-4
CPU
(Central Processing Unit)
Input
Units
Output
Units
Primary Memory

5. INPUT DEVICES
 Those parts of the computer receiving information to
programs.
 Those parts of a computer that allow the user to
communicate with the computer

6. • The Mouse – An input device that
allow user to command computer
through dragging and clicking.
• The Keyboard - The keyboard is still
the most common way of entering
information into a computer

7. Scanners - allows you to scan printed
material and convert it into a file format that
may be used within the PC.
Touch Pads - A device that lays on the
desktop and responds to pressure
Light Pens - Used to allow users to point to
areas on a screen
Joysticks - Many games require a joystick
for the proper playing of the game

8. A DEVICE WHERE SAVING OUR DATA TAKES PLACE,
HOLDS DATA, INFORMATION.

9. TWO TYPES OF STORAGE DEVICES
PRIMARY STORAGE DEVICE –
STORE DATA TEMPORARILY
(RAM)
SECONDARY STORAGE DEVICE–
STORE DATA PERMANENTLY
UNLESS INTENTIONALLY
DELETED.

10. READ ONLY MEMORY
 RAM - Random Access Memory
 The main 'working' memory
used by the computer.
It holds temporary instructions
and data needed to complete
tasks. This enables the CPU – to
access instructions and data
stored in the memory very
quickly.

11. ROM(READ ONLY MEMORY)
The data or program in rom can
only be read but cannot be at all.
All the contents in rom can be
accessed and read but cannot be
changed.
ROM is non – volatile. It holds the
programs and data when the
computer is powered off.

12.  Hard Disks
 Speed:
 Very fast!
 The speed of a hard disk is often quoted as
"average
 access time" speed, measured in
milliseconds. The
 smaller this number the faster the disk.

13. A floppy disk - is a portable,
inexpensive storage medium
that consists of a thin, circular,
flexible plastic disk with a
magnetic coating enclosed in a
square-shaped plastic shell.

14. OUTPUT DEVICES
 ALLOW THE COMPUTER TO
COMMUNICATE WITH THE USER
 GIVE/SHOWS/PRINT THE RESULTS OF
OUR INPUT

15.  Printer - The printer produces a hard copy of
your output, and the computer screen
produces a soft copy of your output.
 Monitor – The computer screen is used for
outputting information in an understandable
format.
 Speakers - Enhances the value of
educational and presentation products.
 Plotters - A plotter is an output device
similar to a printer, but normally allows you to
print larger images.

16. A Liquid Crystal Display (LCD)
projector uses its own light
source to project what is
displayed on the computer on a
wall or projection screen. A
digital light processing (DLP)
projector uses tiny mirrors to
reflect light which can be seen
clearly in a well-lit room.