Input output

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Input DevicesInput Devices

 • Parts of Computer, which are used to

feed data and commands are called Input Devices .

Some Input Devices are:

Keyboard Mouse Joy Stick Scanner Touch Screen

KeyboardKeyboard

Keyboards are input devices. It is used to type words, numbers, and symbols in the computer.

The keys on the keyboard can be classified as follows:

Alphabetic keys Numeric keys Function keys Symbols keys

Special keys

MouseMouse

• Mouse is a pointing device which is used to draw, move and resize the picture and words.

• It has a small ball inside ,which when rolls ,moves the rollers ,which move the pointer on the screen of monitor.

• It has two buttons on the top .

JoystickJoystick

• A joystick consists of vertical bar.

• It can be rotated in various directions.

• This rotation moves the cursor to the desired position.

• It contains various buttons for various functions.

ScannerScanner

• A Scanner is an input device. It is used to make an exact copy of text or a picture and send them to the computer .

• Computer scanners are used to scan images, including documents and photos.

Touch ScreenTouch Screen

• Touch screens only needs a finger touch to supply input to the system, rather than typing on keyboard or pointing with a mouse.

• It is a selection of processing options that are represented with graphical icons.

Output DevicesOutput Devices

• An output device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing system (such as a computer) to the outside world.

The output devices are:

• Monitor • Speaker• Headphone• Printer • Plotter • Projector

MonitorMonitor

• The monitor displays the video and graphics information generated by the computer through the video card.

• Monitors are very similar to televisions but usually display information at a much higher resolution.

SpeakerSpeaker

• Speakers enable the computer to output sound through speakers.

• Speakers are required to listen to music and video CD/DVD sound.

• This also allow us to listen to the computer generated sound. Some monitors have built in speakers.

HeadphoneHeadphone

• Headphones give sound output from the computer.

• They are similar to speakers, except they are worn on the ears so only one person can hear the output at a time.

PrinterPrinter

•  A printer is a device that prints text or illustrations on paper.

• There are many types of printers an they are:

Daisy-wheel Dot-Matrix Ink-Jet printer Laser LED Thermal

PlotterPlotter

 • Plotters are similar to the

computer printers. It is used to draw pictures on paper based on commands from a computer.

• Plotters differ from printers in that they draw lines using a pen.

• They can produce continuous lines. Plotters are used in engineering applications. They are more expensive than printers.

ProjectorProjector

• A projector is a device that enables an image, such as a computer screen, to be projected onto a flat surface.

• These devices are commonly used in meetings and presentations as they allow for a large image to be shown so everyone in a room can see.