INTRODUCTION TO COMPUTERS

1. Basic of Computers
S. SURENTHIRAN
Computer Instructor
GHSS, Madhavalyam, Kanyakumari District

2. Introduction To Computer
What Is Computer ?
It comes from the word “Compute”
Difference Between A Computer & Calculator

3. Father Of Computer
Charles Babbage
1822 – Difference Engine
1842 – Analytical Engine

4. Father Of Computer
1822 – Difference Engine
1842 – Analytical Engine

5. Characteristics of Computer
1) Speed
2) Accuracy
3) Diligence – Free from monotony, tiredness
4) Versatility
5) Storage Capacity
6) No I.Q
7) No Feeling

6. Computer Generation
1) First Generation (1942 – 1955)
2) Second Generation (1955 – 1964)

7. Computer Generation
3) Third Generation (1964 – 1975)
4) Fourth Generation – SSI (Small Scale Integration)
- LSI (Large Scale Integration)
5) Fifth Generation – Artificial Intelligence

8. Classification of Computer
1) Digital Computers
2) Analog Computers
3) Hybrid Computers

9. Laptop

10. Basic Computer Operation

11. Input Devices
1) Keyboard

12. Input Devices
2) Joystick

13. Input Devices
3) Light Pen

14. Input Devices
4) Mouse

15. Input Devices
4) Touch Pad

16. Input Devices
5) MICR (Magnetic Ink Character Recognition)

17. Input Devices
6) Bar Coding

18. Input Devices
7) Scanner

19. Input Devices
8) Digital Camera

20. Output Devices
1) Monitor – CRT - LCD

21. Output Devices
2) Printers - Daisy Wheel Printer
- Line Printer

22. Output Devices
2) Printers - Dot Matrix Printer

23. Output Devices
2) Printers - Ink Jet Printer

24. Output Devices
2) Printers - Laser Printer

25. Storage Device
1) Primary Storage Device
1) ROM (Read Only Memory)
2) PROM (Programmabel ROM)
3) EPROM (Erasable PROM)
4) EEPROM (Electrically EPROM)
5) RAM
2) Secondary Storage Device
1) Floppy Disk (FDD)
2) Compact Disk (CD)
3) Hard Disk (HDD)
RAM
EPROM

26. Secondary Storage Device
Floppy Disk (FDD)

27. Secondary Storage Device
Hard Disk (HDD)

28. Secondary Storage Device
CD Drive / DVD Drive

29. Representing Characters In Memory
8 Bit - 1 Byte
1024 Bye - 1 Kilo Byte (KB)
1024 KB - 1 Mega Byte (MB)
1024 MB - 1 Giga Byte (GB)
1024 GB - 1 Tera Byte (TB)

30. Hardware & Software
Hardware – Physical Components of a computer
Software – Set of Programs Or instruction Written By The
Users

31. Concept Of Operating System

32. Operating System

33. Concept Of Operating System
• Optimizes man-machine capabilities
• Integrated system of programs
• Supervises operations of CPU
• Controls Input / Output

34. Inside The System Unit

35. Inside The System Unit

36. Computer Virus
Computer virus is a program that is loaded onto your computer
without your knowledge and runs against your wishes
Activities of Computer Virus?
 It perform some activities like deleting
files or disturbing your computer settings.
 All computer viruses are man made.
 A simple virus is dangerous because it will quickly use all available memory and
bring the system to a halt.

37. Internet

38. Internet
Internet stands for Interconnected Network – Connected
Through Telephone Wires.
The Internet, a network of networks, is popularly called the net.

39. History of Internet
1969 – ARPANET (Advanced Research Projects Agency Network)
1980 – NSFNET (National Science Foundation NET)

40. Requirement For Connecting To The Internet
1) Modem
2) Telephone Line
3) Subscription with Interest Service Provider (ISP)
4) Web Browser

41. Types of Modem
1) Internal Modem
2) External Modem

42. Web Browser
Software Application used to locate and display the web page
1) Netscape Navigator
2) Internet Explorer
3) Fire Fox
4) Mozilla

43. Web Page
A web page is a document on the Web. Web Pages can include
text, pictures, sound and video.

44. Web Site
The website is a of one or more related web pages, linked
together through a system of hyperlinking.
A website is similar to a magazine

45. Home Page
First Page of information when the website is typed
Typically contains introductory information about the website

46. Hyperlink
A hypertext document contains highlighted text that connects to
other pages on the web.
When the mouse pointer moved over a hypertext or hiperlink the
shape of the cursor changes to a hand sysbol
Example

47. URL
Uniform Resource Locator
Each web page has a unique address called URL
You can instantly display the webpage if we know the URL
Example
www.iteducationjobs.com
www.rediffmail.com
www.tn.nic.in
www.gmail.com

48. Search Engines
A search engine is a program that searches through a collection
of web pages for particular information
Examples
www.altavista.com
www.altheweb.com
www.google.com
www.hobot.lycos.com
www.infoseek.com

49. Electronic Mail
Exchange electronic mail (e-mail) with people around the world.
E-Mail Address
Username@domainname
Eg: surenteach@gmail.com

50. Parts Of A Message
1) From
2) To
3) Subject
4) CC
5) BCC
6) Message

51. MS-OFFICE

52. MS-OFFICE
MS-OFFICE
• MS-Word
• MS-Excel
• MS-PowerPoint
• MS-Outlook Express

53. THANK YOU