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Basics of computer
- 2. IN THIS LESSON WE WILL LEARN ABOUT • Basic Design • Different Operations • Hardware • Software
- 3. WHAT IS A COMPUTER? It is a device which transforms data into meaningful information.
- 5. PERIPHERAL DEVICES #3 types of peripheral devices • INPUT • OUTPUT • Other Devices
- 7. KEYBOARD • Most common input device • QWERTY keyboards are used widely • Standard keyboards contain about 104 keys
- 8. MOUSE • Electro mechanical, hand held device • Used as a pointer • Performs functions like selecting, pointing, moving icons, choosing, clicking, etc. • Two types of Mice - optical - magnetically coated
- 9. LIGHT PEN It utilizes a light-sensitive detector to select objects on a display screen
- 11. TOUCH SCREEN • Used as alternatives to keyboards
- 12. MICROPHONE (VOICE INPUT) • It is an input device that uses voice as input • There are two types of microphones 1. Desktop 2. Handheld
- 13. TRACKBALL • Pointing device • To point we have to use the ball and move it • There are generally three buttons located near the ball Advantage- They take up lesser space than mice to work in.
- 14. OUTPUT DEVICES • Monitor • Printer • Plotter • Speaker
- 15. MONITOR • Most important output device • Information is displayed on monitors • They are usually of three types• CRT Cathode Ray Tube • LCD Liquid Crystal Display • LED Light Emitting Diode
- 16. PRINTERS-- Different Types Of Printer- • Laser Printer • Ink-Jet Printer • Dot-matrix Printer • Line Printer
- 17. LASER PRINTER • Most efficient • Most expensive • Fastest home printers • Prints up to 200 pages in monochrome and 100 pages in black and white per minute • Extremely Fast and Quiet • Best Technology • For home use
- 18. INK-JET PRINTER • Sprays ink on the paper • It sprays ink through its 64 nozzles • Costs about half the price of a laser printer • For office use
- 19. DOT- MATRIX PRINTERS • Versatile and Inexpensive output device • Less expensive than laser and ink-jet printers • Louder • Faster • Produces low print quality • For heavy duty printing purposes
- 20. LINE PRINTER • Line printers are generally used in large computer systems to produce text based data processing reports • These are high speed printers that print from 100 to about 3800 lines per minute • They cost in lakhs of rupees
- 21. PLOTTER There are two types of plotters • Flat bed plotter • Drum plotter
- 22. SPEAKERS • There are two types of speakers • Speakers • Earphones/ Headphones
- 23. SOFTWARE Software is a term for the various kinds of programs used to operate computers There are three types of Software • System software • Application software • Generalised software • Customized software
- 25. Low Level Languages • These are languages which are understood by computers • Assemblers are used to write code • Machine (binary) • Assembly
- 26. High Level Languages • They are languages that are used by humans to program • Compilers are used to write and compile code • Examples are C, C++, BASIC, JAVA, HTML., Etc.