PREPARED BY:-

Bharti Mehta

CLASS- XII

JNV Mansa

Guided By:-

Mr. Beant Sharma

FCSA

JNV Mansa

COMPUTERCOMPUTER

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

Parts:- CPU, Monitor, Key Parts:- CPU, Monitor, Key Board, Mouse, Speaker, Board, Mouse, Speaker,

Printer.Printer.

CPUCPU Central Processing Unit (CPU) Central Processing Unit (CPU)

is main component or “brain” is main component or “brain” of a computer, which performs of a computer, which performs all the processing of input all the processing of input data. Its function is to fetch, data. Its function is to fetch, examine & then execute the examine & then execute the instructions stored in the main instructions stored in the main memory of a computer.memory of a computer.

CPU consist of following CPU consist of following parts:-parts:-

1.1. Arithmetic Logic Unit (ALU)Arithmetic Logic Unit (ALU)2.2. Control Unit (CU)Control Unit (CU)3.3. RegistersRegisters4.4. BusesBuses5.5. ClockClock

. .

MONITORMONITOR

Visual Display Unit Visual Display Unit (VDU), commonly (VDU), commonly called Monitor is called Monitor is the main output the main output device of a device of a computer.computer.Types of MonitorsTypes of Monitors

1.1. Monochrome Monochrome MonitorsMonitors

2.2. Colour MonitorsColour Monitors

KEYBOARDKEYBOARD A Key board is similar to a A Key board is similar to a

typewriter. It is main input device typewriter. It is main input device of a computer. Types of Keys:-of a computer. Types of Keys:-

a) Alphanumeric Keys:- used to a) Alphanumeric Keys:- used to type all alphabets, no. & special type all alphabets, no. & special symbols like $, %, @, ^, etc.symbols like $, %, @, ^, etc.

b) Special Keys:- that is for b) Special Keys:- that is for <Shift>, <Ctrl>, <Alt>, <Home>, <Shift>, <Ctrl>, <Alt>, <Home>, <Scroll Lock>< etc.<Scroll Lock>< etc.

c) Function Keys:- They are <F1>, c) Function Keys:- They are <F1>, <F2>, <F3>, etc. used to give <F2>, <F3>, etc. used to give commands depends upon commands depends upon software used.software used.

MOUSEMOUSE MMouse is a basic is a basic

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

PRINTERPRINTER

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

TYPES OF PRINTERTYPES OF PRINTER

a) Impact Printer:- The Printers that a) Impact Printer:- The Printers that print the characters by striking print the characters by striking against the ribbon & onto the paper against the ribbon & onto the paper are called impact printer. These are are called impact printer. These are of two types:- of two types:-

1.1. Character PrinterCharacter Printer

2.2. Line PrinterLine Printer..

NON IMPACT PRINTERNON IMPACT PRINTER

The printers that The printers that print the characters print the characters without striking without striking against the ribbon & against the ribbon & onto the paper are onto the paper are called non impact called non impact printer. printer. These are of three These are of three types :-types :-

1.1. Laser printerLaser printer2.2. Inkjet printerInkjet printer3.3. Thermal printerThermal printer

SPEAKERSPEAKER Speaker is one the Speaker is one the

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