Download - INTRODUCTION TO COMPUTERS
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Basic of Computers
S. SURENTHIRANComputer InstructorGHSS, Madhavalyam, Kanyakumari District
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Introduction To Computer
What Is Computer ?
It comes from the word “Compute”
Difference Between A Computer & Calculator
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Father Of Computer
Charles Babbage
1822 – Difference Engine1842 – Analytical Engine
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Father Of Computer
1822 – Difference Engine
1842 – Analytical Engine
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Characteristics of Computer
1) Speed2) Accuracy3) Diligence – Free from monotony, tiredness4) Versatility5) Storage Capacity6) No I.Q7) No Feeling
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Computer Generation
1) First Generation (1942 – 1955)
2) Second Generation (1955 – 1964)
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Computer Generation
3) Third Generation (1964 – 1975)
4) Fourth Generation – SSI (Small Scale Integration)- LSI (Large Scale Integration)
5) Fifth Generation – Artificial Intelligence
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Classification of Computer
1) Digital Computers2) Analog Computers3) Hybrid Computers
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Laptop
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Basic Computer Operation
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Input Devices
1) Keyboard
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Input Devices
2) Joystick
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Input Devices
3) Light Pen
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Input Devices
4) Mouse
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Input Devices
4) Touch Pad
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Input Devices
5) MICR (Magnetic Ink Character Recognition)
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Input Devices
6) Bar Coding
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Input Devices
7) Scanner
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Input Devices
8) Digital Camera
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Output Devices
1) Monitor – CRT - LCD
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Output Devices
2) Printers - Daisy Wheel Printer
- Line Printer
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Output Devices
2) Printers - Dot Matrix Printer
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Output Devices
2) Printers - Ink Jet Printer
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Output Devices
2) Printers - Laser Printer
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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
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Secondary Storage Device
Floppy Disk (FDD)
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Secondary Storage Device
Hard Disk (HDD)
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Secondary Storage Device
CD Drive / DVD Drive
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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)
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Hardware & Software
Hardware – Physical Components of a computer
Software – Set of Programs Or instruction Written By The Users
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Concept Of Operating System
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Operating System
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Concept Of Operating System
• Optimizes man-machine capabilities• Integrated system of programs• Supervises operations of CPU• Controls Input / Output
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Inside The System Unit
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Inside The System Unit
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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.
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Internet
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Internet
Internet stands for Interconnected Network – Connected Through Telephone Wires.
The Internet, a network of networks, is popularly called the net.
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History of Internet
1969 – ARPANET (Advanced Research Projects Agency Network)
1980 – NSFNET (National Science Foundation NET)
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Requirement For Connecting To The Internet
1) Modem2) Telephone Line3) Subscription with Interest Service Provider (ISP)4) Web Browser
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Types of Modem
1) Internal Modem2) External Modem
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Web Browser
Software Application used to locate and display the web page
1) Netscape Navigator2) Internet Explorer3) Fire Fox4) Mozilla
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Web Page
A web page is a document on the Web. Web Pages can include text, pictures, sound and video.
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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
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Home Page
First Page of information when the website is typed
Typically contains introductory information about the website
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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
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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
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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
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Electronic Mail
Exchange electronic mail (e-mail) with people around the world. E-Mail Address
Username@domainname
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Parts Of A Message
1) From2) To3) Subject4) CC5) BCC6) Message
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MS-OFFICE
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MS-OFFICE
MS-OFFICE
• MS-Word• MS-Excel• MS-PowerPoint• MS-Outlook Express
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THANK YOU