3. PREPARED BY:- Bharti Mehta CLASS- XII JNV Mansa Guided By:- Mr. Beant Sharma FCSA JNV Mansa

5. COMPUTER Computer is an electronic device which gets input data, process it & display output.

6. Parts:- CPU, Monitor, Key Board, Mouse, Speaker, Printer.

7. CPU Central Processing Unit (CPU) is main component or “brain” of a computer, which performs all the processing of input data. Its function is to fetch, examine & then execute the instructions stored in the main memory of a computer. Central Processing Unit (CPU) is main component or “brain” of a computer, which performs all the processing of input data. Its function is to fetch, examine & then execute the instructions stored in the main memory of a computer. CPU consist of following parts:- CPU consist of following parts:- 1. Arithmetic Logic Unit (ALU) 2. Control Unit (CU) 3. Registers 4. Buses 5. Clock.

8. MONITOR Visual Display Unit (VDU), commonly called Monitor is the main output device of a computer. Visual Display Unit (VDU), commonly called Monitor is the main output device of a computer. Types of Monitors 1. Monochrome Monitors 2. Colour Monitors

9. KEYBOARD A Key board is similar to a typewriter. It is main input device of a computer. Types of Keys:- A Key board is similar to a typewriter. It is main input device of a computer. Types of Keys:- a) Alphanumeric Keys:- used to type all alphabets, no. & special symbols like $, %, @, ^, etc. a) Alphanumeric Keys:- used to type all alphabets, no. & special symbols like $, %, @, ^, etc. b) Special Keys:- that is for,,,,,,,, < etc. c) Function Keys:- They are,,, etc. used to give commands depends upon software used. c) Function Keys:- They are,,, etc. used to give commands depends upon software used.

10. MOUSE M is a basic input device. IT is a pointing device used to move cursor, draw sketches/ diagrams, seleccting a text/ object/ menu item, etc. on the monitor screen. Mouse is a basic input device. IT is a pointing device used to move cursor, draw sketches/ diagrams, seleccting a text/ object/ menu item, etc. on the monitor screen.

11. PRINTER It is an output device, which is used to print information on paper.

12. TYPES OF PRINTER a) Impact Printer:- The Printers that print the characters by striking against the ribbon & onto the paper are called impact printer. These are of two types:- a) Impact Printer:- The Printers that print the characters by striking against the ribbon & onto the paper are called impact printer. These are of two types:- 1. Character Printer 2. Line Printer.

13. NON IMPACT PRINTER The printers that print the characters without striking against the ribbon & onto the paper are called non impact printer. The printers that print the characters without striking against the ribbon & onto the paper are called non impact printer. These are of three types :- 1. Laser printer 2. Inkjet printer 3. Thermal printer

14. SPEAKER Speaker is one the essential output device of a multimedia computer used to produce sound & music. There are many models if stereo speakers with different size & volume capacities. Speaker is one the essential output device of a multimedia computer used to produce sound & music. There are many models if stereo speakers with different size & volume capacities.