Basic of Computers

S. SURENTHIRANComputer InstructorGHSS, Madhavalyam, Kanyakumari District

Introduction To Computer

What Is Computer ?

It comes from the word “Compute”

Difference Between A Computer & Calculator

Father Of Computer

Charles Babbage

1822 – Difference Engine1842 – Analytical Engine

Father Of Computer

1822 – Difference Engine

1842 – Analytical Engine

Characteristics of Computer

1) Speed2) Accuracy3) Diligence – Free from monotony, tiredness4) Versatility5) Storage Capacity6) No I.Q7) No Feeling

Computer Generation

1) First Generation (1942 – 1955)

2) Second Generation (1955 – 1964)

Computer Generation

3) Third Generation (1964 – 1975)

4) Fourth Generation – SSI (Small Scale Integration)- LSI (Large Scale Integration)

5) Fifth Generation – Artificial Intelligence

Classification of Computer

1) Digital Computers2) Analog Computers3) Hybrid Computers

Laptop

Basic Computer Operation

Input Devices

1) Keyboard

Input Devices

2) Joystick

Input Devices

3) Light Pen

Input Devices

4) Mouse

Input Devices

4) Touch Pad

Input Devices

5) MICR (Magnetic Ink Character Recognition)

Input Devices

6) Bar Coding

Input Devices

7) Scanner

Input Devices

8) Digital Camera

Output Devices

1) Monitor – CRT - LCD

Output Devices

2) Printers - Daisy Wheel Printer

- Line Printer

Output Devices

2) Printers - Dot Matrix Printer

Output Devices

2) Printers - Ink Jet Printer

Output Devices

2) Printers - Laser Printer

Storage Device

1) Primary Storage Device1) ROM (Read Only Memory)2) PROM (Programmabel ROM)3) EPROM (Erasable PROM)4) EEPROM (Electrically EPROM)5) RAM

2) Secondary Storage Device1) Floppy Disk (FDD)2) Compact Disk (CD)3) Hard Disk (HDD)

RAM

EPROM

Secondary Storage Device

Floppy Disk (FDD)

Secondary Storage Device

Hard Disk (HDD)

Secondary Storage Device

CD Drive / DVD Drive

Representing Characters In Memory

8 Bit - 1 Byte1024 Bye - 1 Kilo Byte (KB)1024 KB - 1 Mega Byte (MB)1024 MB - 1 Giga Byte (GB)1024 GB - 1 Tera Byte (TB)

Hardware & Software

Hardware – Physical Components of a computer

Software – Set of Programs Or instruction Written By The Users

Concept Of Operating System

Operating System

Concept Of Operating System

• Optimizes man-machine capabilities• Integrated system of programs• Supervises operations of CPU• Controls Input / Output

Inside The System Unit

Inside The System Unit

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.

Internet

Internet

Internet stands for Interconnected Network – Connected Through Telephone Wires.

The Internet, a network of networks, is popularly called the net.

History of Internet

1969 – ARPANET (Advanced Research Projects Agency Network)

1980 – NSFNET (National Science Foundation NET)

Requirement For Connecting To The Internet

1) Modem2) Telephone Line3) Subscription with Interest Service Provider (ISP)4) Web Browser

Types of Modem

1) Internal Modem2) External Modem

Web Browser

Software Application used to locate and display the web page

1) Netscape Navigator2) Internet Explorer3) Fire Fox4) Mozilla

Web Page

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

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

Home Page

First Page of information when the website is typed

Typically contains introductory information about the website

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

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.comwww.rediffmail.comwww.tn.nic.inwww.gmail.com

Search Engines

A search engine is a program that searches through a collection of web pages for particular information

Examples

www.altavista.comwww.altheweb.comwww.google.comwww.hobot.lycos.comwww.infoseek.com

Electronic Mail

Exchange electronic mail (e-mail) with people around the world. E-Mail Address

Username@domainname

Eg: surenteach@gmail.com

Parts Of A Message

1) From2) To3) Subject4) CC5) BCC6) Message

MS-OFFICE

MS-OFFICE

MS-OFFICE

• MS-Word• MS-Excel• MS-PowerPoint• MS-Outlook Express

THANK YOU