BY- UPENDRA SHARMA

It is a electronic machine. When we gives input in a computer it

takes and process then and after then it gives output.

It is a very versatile machine. It has more much speed

There is two type of computer. 1-Analog 2- Digital

Analog computer are those computer whose handle or process about physical nature.

Ex- temperature, pressure etc.

Digital computers are binary based computers.

It is create information only two state, namely 0 and 1.

Micro computer Mini computer Main frame computer Super computer

Speed Accuracy Diligence Multi tasking Memory (power of remaining)

All input output and secondary storage devises of a computer is called peripheral devices.

Input devises Output devices Secondary storage devises

(a) key board (b) mouse (c) scanner (d) joystick (e) light pen (f) web cam (g) mice

It is similar to a type writer. It is use to feed data in a computer. It contain alphabets, digits, special

character keys , function keys, and some control keys.

we can use one and more keys together for a special task.

Like ctrl + s to save. ctrl+ alt+ del to task manager and log

off the pc.

It is a pointing input device. It is use to move the cursor on the

screen. The muse also use to draw sketches,

diagram est.. One type of mouse rolling ball and the

second type use optical technique.

If we want insert image in a computer then we use scanner,

It convert hard copy in soft copy. A scanner is a optical device that

analysis image , text ,or hand writing, and convert in to a digital form.

A joystick is also a pointing device. It is use to move curser on the screen. its function similar to a mouse. It is mainly use to play video games.

Web cam is input device . It is use to insert picture in a

computer. By the web cam we can do video

calls.And share the live video.

It is a input devise It is use to input signature and any

hand writing in a computer.

`MICE

IT I s a audio input device. Which is use to input audio in a

computer. By the mice we can call through the

internet in a computer.

Output devise are those devise of computer that supply information result in the hard copy and soft copy.

Monitor Printer Plotter Projector Speech synthesizer

It is also called visual display unit (VDU) .

It is similar like a television. Whatever we type by the keyboard we

can see on monitor Its comes in two types black white and

color. Black and white shows only two colors,

and color monitor display many colors .

It has three type (1) CRT (cathode rays tube) (2) LCD (liquid crystal display) (3) TFT (thin film transistors)

A CRT monitor is very similar to a television.

In a cart monitor we show the picture through a picture tube.

The picture tube fire a narrow beam of electronic at the screen, the beam strike the screen and then we show picture.

LCD monitors is the flat panel monitors.

It has very large numbers of liquid crystal show a picture and text.

Printers are output devices that refers hard copy output.

It use ink to print in a page. Printer gives best quality output . It can print color and black and white.

There is three types of printers. (1) Dot matrices printer(DMP) (2) Ink jet printers (3) Lager printers

Dot matrix printer use head ribbon and pins to give output.

Its printing similar to type writer printing. When we give the print it is reduce very much

noise.- It is slower then inkjets and lager printers. It is use a tractor feed mechanism to transfer

paper through a printer. It is comes in two size. 80 column dot matrix

and 132 Colum dot matrix.

That printer refers in non impact printer . Ink jet printers use to color cartridge to

printing. Inkjet printer spray ink into paper to form

image or text. It can print both type color and black. It reduce might sound it time to print. in this printer print head moves across the

paper horizontally. print quality measured in DPI , its printing is

150 to 1200 DPI.

That printer only soles in business . This printer use a laser beam to produce

image or text in a paper. The main component of this printer is drum

and toner A laser printer can also print in both type

color and black and white. It can print with a speed 4-16 pages per min. Its printing quality is 300 1200 dpi .

A plotter is a specialize graphical printing .

It is operated moving a pen. It is use mechanical or thermal

technology to create large amount of image.

It is use to technical drawing or CAD application and graphical image .

Speaker are use to produce audio output . That is work in conjunction with sound card to

produce the audio output. Some of the common feature that are included in

most of speaker are An LED indicator. 3.5mm headphone jack. Volume controller A remote volume control.

Projector is out put device to use connect to a PC.

It is use to project information on a large screen.

Its widely use to giving permutation. Any audio video image and text displayed

by the projector. Projector makes presentation more lively

and interesting.