1. Order of presentation
• Slide (introduction) vaibhav
• Slide (i/p & o/p) varun
• Slide (storage device) ankit
• Slide (memory) vivek
• Slide (cpu & uses) vinay

2. Computer Basics
By:-
Ankit Bist
Vaibhav Goyal
Varun Venugopalan
Vinay Mehta
Vivek Gupta

3. What is a computer ?
Definition:
A Computer is a device that accepts input, processes data, and
produces an output according to a series of stored instructions.
A computer is composed of hardware and software , and is
available in different sizes and configuration

4. Data v/s Information
Data refers to symbols that represent facts or
ideas…these really don’t mean anything until
they are processed, or put in some sort of
context. Then they become information…so
data is raw and information is processed.

5. Hardware
The hardware is the part of the computer you can
touch and see.
e.g keyboard, monitor, disks, wires, chips, etc.

6. Hardware components
INPUT DEVICES -- “How to tell what to do”
Keyboards and mouse are the standard way to interact
with the computer. Other devices include joystick and
game pads(console) for gaming purpose.
OUTPUT DEVICES – “How it shows you what it is doing”
The monitor is how the computer send information back to
you. A printer is also an output device

7. Hardware components
INPUT DEVICES
• MOUSE -- small hand held device that attaches to the
computer. It may have two or three buttons. The mouse is
used to move the cursor (pointer) on the computer screen.
• KEYBOARD-- what you type on, similar to a typewriter.
• TRACKERBALL -- alternative to mouse , used by graphic
designer
• SCANNERS -- similar to a color photocopier is a device that
captures pictures or documents, so that they can be seen or
used on the computer
and many more like joystick, touchpad etc

8. Hardware components
OUTPUT DEVICES
• MONITOR/ VDU – It is the display screen, similar to a
television screen
• PRINTERS – It is a device that puts what you have created
on to a paper.
• SPEAKERS – It enhances the value of educational and
presentation products.
and many more like plotter , headphones etc

9. Hardware components
STORAGE DEVICES – “How it saves data and programs”
•Hard disc drives –
the internal higher capacity drive
Speed- fast
High capacity ( measured in gigabytes)
•Floppy drives (diskettes) –
Speed- very slow
Very cheap
Unreliable and low capacity ( 1.44 mb)

10. Hardware components
•CD (compact disk) –
Speed- slower than hard disk but faster than floppy disk
(specifies in terms of 1x , 8x , 16x , 32x etc)
Capacity – 750 MB
•DVD (digital video disk) –
Speed - faster than CD
Capacity - 4.2 GB to 17 GB
Cost - higher than CD
•Pen Drive –
Speed - faster than DVD
Capacity – 1 GB to 16 GB

11. Memory
Memory – “how the processor stores and uses immediate
data”
• RAM (Random access memory)
It is the main working memory of the computer
When computer is turned on , operating system is
copied into this memory only
It is a volatile memory i.e data is lost as when
computer is turned off
More RAM means faster computer

12. Memory
• ROM (Read only memory)
It is a special type of memory chip that holds
software which can be read but not written to.
Often network cards and video cards also contain
ROM chips

13. The Central Processing Unit
• A CPU is on a chip called a microprocessor
• It continuously follows the fetch-decode-execute cycle:
Retrieve an instruction from main memory
fetch
execute decode
Carry out the Determine what the
instruction instruction is

14. The Central Processing Unit
• The CPU contains:
Performs calculations
Arithmetic / Logic Unit and makes decisions
Coordinates
Control Unit processing steps
Small storage
Registers areas

15. USES OF COMPUTER
PC @ HOME
•Web browsing
•Chat/ mail
•Computer games
•Banking from home etc……………
PC @ OFFICE
•Accounts
•Payroll / Attendance
•Presentations
•Product designing etc…….

16. Questions?

17. Thank You!