Input and Output devise Major: Information Technology Name: Sarah AL-Zayer ID: 201100848 Major: Information Technology Section: 201

outline Introduction Input device Output device Conclusion Keyboard Mouse Scanner The Speech Input Device Output device Printer Monitor Speaker Plotter Conclusion

Input Device: An input device is a device that is connected to a computer in order to input data. An example would be a keyboard, mouse, joystick, scanner, etc.

Keyboard … The keyboard is one of the most popular ways of inputting information into a computer. It is a text base input device that allows the user to input alphabets, numbers and other characters. It consists of a set of keys mounted on a board.

Special-function Keys Keyboard … Function Keys Numeric Keypad Alphanumeric Keypad/ Special-function Keys Cursor Movement Keys

Mouse … The mouse pointing device sits on your work surface and is moved with your hand. In older mice, a ball in the bottom of the mouse rolls on the surface as you move the mouse, and internal rollers sense the ball movement and transmit the information to the computer via the cord of the mouse. Two-button mouse with scroll wheel

cordless or wireless mouse A cordless or wireless mouse communicates with the computer via radio waves (often using Bluetooth hardware and protocol) so that a cord is not needed (but such mice need internal batteries).

Scanner … Scanner is an input device used for direct data entry from the source document into the computer system. It converts the document image into digital form so that it can be fed into the computer. Capturing information like this reduces the possibility of errors typically experienced during large data entry.

The Speech Input Device

Output Device An output device is a device which is used to view data given out by a computer, be it a printer, monitor or speaker.

Printer … Printers are used to produce paper (commonly known as hardcopy) output. Based on the technology used, they can be classified as Impact or Nonimpact printers.

Laser Printer A laser printer is a common type of computer printer that rapidly produces high quality text and graphics on plain paper. As with digital photocopiers and MFPs, laser printers employ axero graphic printing process but differ from analog photocopiers in that the image is produced by the direct scanning of a laser beam across the printer's photoreceptor. A laser beam projects an image of the page to be printed onto an electrically charged rotating drum coated with selenium.

Dot Matrix Printer A dot matrix printer forms characters and graphics on the paper by producing pattern of dots. If you look closely at a print out from a dot matrix printer you will see the tiny dots which make upthe printout. The part of the printer which forms the pattern of dots is called the print head. Dotmatrix printers are relatively cheap and so is the stationery that they use. The quality of dot matrixprinter depends on the pins there in print head. ‘9’ pin print will produce poor print and ‘24’ pinprint will produce much good print than the ‘9’ pin print. These printers often make noise.

Inkjet Printers Inkjet printers work like Dot Matrix printer (the printouts that they produce are made up of patterns of very small Dots) but the printer head has a set of tiny holes rather than pins. As the print headmoves across the paper, ink is forced out through the holes to form the image. Inkjet Printers arevery quite to operate and can produce good quality printouts of both graphics and text. Relativelycheap color graphics can be printed using a color inkjet. 

Monitor … Monitor is an output device that resembles the television screen and uses a Cathode Ray Tube (CRT) to display information. The monitor is associated with a keyboard for manual input of characters and displays the information as it is keyed in. It also displays the program or application output. Like the television, monitors are also available in different sizes.

Speakers … A speaker or speaker system is an electro acoustical transducer that converts an electrical signal to sound. The term loudspeaker can refer to individual transducers (known as drivers), or to complete systems consisting of a enclosure incorporating one or more drivers and electrical filter components. Loudspeakers, just as with other electro acoustic transducers, are the most variable elements in an audio system and are responsible for the greatest degree of audible differences between sound systems.

Plotter … A plotter is a vector graphics printing device that connects to a computer. There are two types of main plotters. Those are pen plotters and electrostatic plotters. Pen plotters print by moving a pen across the surface of a piece of paper. This means that plotters are restricted to line art, rather than raster graphics as with other printers. Pen plotters can draw complex line art, including text,but do so very slowly because of the mechanical movement of the pens.

Conclusion …