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Lecture 1


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basics of computers

basics of computers

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  • 1. Computer Basics
  • 2. Objective Upon completion of this lecture you will understand: • Need of Computer Literacy • What is a Computer? • Its advantages over the manual system. • Components of a computer system.
  • 3. Need For Computer Literacy In most places of business, a computer is standard. • Bank - to look up account information. • Library - card catalog — to use a computerized database. • Doctors' offices - to store patient information. • It will help in getting a job and it will help you advance in your career. • Computer literacy does not mean you need to know how to use every single piece of software. • It does not mean you need to know how to write programs or network of computers. • You just need to know some basics — how to save and open a file, how to use a word processing program, and how to send and receive email. • Having some sort of level of comfort around computers rather than a look of fear.
  • 4. Application of Computer System Today computer is used almost in every field. For example. It is used in • Banks • Railways • Hospitals • Airports • Schools/Colleges and many more……..
  • 5. What is Computer? A computer is programmable electronic device which inputs data, processes it, giving information according to the instructions provided. Computer System Data Information PROCESSING Example: Data is marks of 60 students. Process to find highest scorer. Information is the name of topper.
  • 6. Components of Computer System What is the difference between the computer and computer system? Computer refers to the actual physical electronic device. Whereas the computer system includes following: • Hardware – any physical component which we can touch/see. • Software – data contained in the hardware, similar to songs in audio cassette . • Live ware (user) – the computer operator
  • 7. Computer Hardware
  • 8. Computer Hardware We can classify the computer hardware as: • Input Devices – those devices which are used for entering data to the computer. Example: Keyboard, Mouse, Scanner, Web camera etc. • Output Devices – those devices on which we obtain information out from the computer. Example: Monitor, Printer. • Central Processing Unit – central unit which does all the processing, accepts data from input device and send processed data to the output device.
  • 9. CPU CPU I O CU ALU N U P T U P T Memory (RAM) U T Secondary Storage
  • 10. Continued…. Have you seen CPU? If so how it looks like? Ans: It looks like BOX No, You are talking about cabinet, which includes following:  Processor  RAM/ROM  Floppy Disk Drive  Hard Disk Drive  CD Drive  Power Supply Unit  Mother Board  Data Buses  Ports
  • 11. Computer Software
  • 12. Types of Computer Software Computer software can be categorized into following two categories: 1. System Software: includes those software that help in better utilization hardware resources. Example Operating System, Compiler, Disk Drivers etc. 2. Application Software: includes those software that helps in performing a particular task such as creating a document, preparing a presentation. These are general purpose software's. Example: Ms-Word, Excel, Power Point, etc. 3. Utility Software: includes those software that generally comes along with operating system used to perform basic activities. Example: Disk Format Utility, Disk Defragmenter Utility, etc. 4. Customized Software : includes software which are specially designed for a particular group of users. Example: Software for a bank, hospital, business organization, etc.