What are Computers ? <ul><li>A Computer is an Electronic Device . </li></ul><ul><li>It is a data processing machine, which accepts data and instructions. </li></ul><ul><li>It is called a computer system, as it is not a single machine but a collection of many devices which work together to perform a task. </li></ul>
DATA PROCESSED INFORMATION 2. Output to a Computer system. 2. Input to a Computer system. 1. End product of Data Processing. 1. Collection of Facts & Figures. INFORMATION DATA
Places where Computers are Used <ul><li>Banks </li></ul><ul><li>Schools </li></ul><ul><li>Offices </li></ul><ul><li>Shops </li></ul><ul><li>Railway Stations </li></ul><ul><li>The influence of computers is universal </li></ul><ul><li>Airports </li></ul><ul><li>Homes </li></ul><ul><li>Research Center </li></ul><ul><li>Hospitals </li></ul>
Categorization of Computers Categorization of Computers Based on Size Based on Purpose Microcomputers Minicomputers Mainframe Super Computers PC Laptop Palmtop Analog Computers Hybrid Computers Digital Computers
Analog Computers : Analog computer works on the principle of analogous data. The Computers which can process analog signals, is know as Analog Computer. For eg. Pressure gauge, ECG Machine etc. Digital Computers : Digital computer works on the principle of binary system. Each and every instruction and data are to be converted in 0’s and 1’s which the machine understands.
Micro Computers : Micro computers, also called Personal computers are small enough to be kept on the table. They use a Silicon chip, called microprocessor.
Personal Computer : Commonly seen in the form of Desktop Computers used at offices, homes, shops, schools etc. Types of Microcomputers
Laptop : Also called as Notebook, can be used easily by carrying it from one place to another.
Palmtop : It is a kind of Micro computer which fits in the hand/palm and can be carried in a pocket . It works with the help of a pen which is used to select things on the screen.
Mini Computers : Mini computer is larger and more powerful than a PC. They work at high speed and support many users at the same time .
Mainframe Computers : Mainframe computer is very large, powerful and expensive. It has ‘thousands’ of PC’s attached to it. They occupied an entire room.
Super Computers : Super computer is the fastest computer used till today. They are being used a lot in research work, to process complex scientific calculations.