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Input and Output Devices.

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Showing you a varaeity of input and output devices of a computer.

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Input and Output Devices.

  1. 1. Input and Output devices Chapter 2 2.2.2
  2. 2. Input Devices Alice A. Antwi
  3. 3. What Is An Input Device. <ul><li>Entering data or instructions into a computer is called input. Therefore, an input device is a device which enters data or instructions into a computer. </li></ul><ul><li>Input devices are necessary to convert data into a form which can be understood by computers. </li></ul><ul><li>Some input devices are: </li></ul>
  4. 4. Mouse Joystick Scanner Keyboard and bar code reader
  5. 5. The Mouse <ul><li>This input device controls the cursor on the computer screen. It has two or three buttons and a cable connecting it to the computer. It is quite easy to operate a mouse, the user simply moves the cursor along the table. Once the cursor is at the desired location, the user can give instructions to the computer by clicking the button. </li></ul>
  6. 6. The Joystick <ul><li>A joystick looks like a stick fixed onto a box. It controls the cursor on the screen, so we can say it is alternate to the mouse. </li></ul><ul><li>The Keyboard </li></ul><ul><li>Keyboards come in different shapes and sizes depending on the type of brand. They are similar to typewriters. </li></ul>
  7. 7. The Scanner <ul><li>This looks like a photocopying machine, its function is to scan any document placed on its flat glass and send the contents to the computer. </li></ul><ul><li>The Bar Code Reader </li></ul><ul><li>The black and white lines printed on certain products which represent information like the country of origin, the price of it etc are bar codes. They can be read by a bar code reader which are commonly used in Supermarkets and shops. </li></ul>
  8. 8. What is an Output device? <ul><li>The information we get from the computer is known as output. The computer presents this information through these devices such as: </li></ul>
  9. 9. Monitor Printer Plotter Microfilm
  10. 10. The Monitor <ul><li>The monitor is one of the most important output devices, it is used to display text and pictures. The monitor is also known as the Visual Display Unit (VDU) </li></ul><ul><li>The Printer </li></ul><ul><li>There are several types of printers, some are: </li></ul><ul><li>Dot matrix- Consists of a print head with a number of pins which move in and out to print in the form of dots. </li></ul><ul><li>Ink- jet- Consists of a print head with a number of tiny nozzles and coloured ink to form tiny dots. </li></ul><ul><li>Laser- Prints images by transferring ‘ ink powder’ onto a piece of paper using a laser beam. </li></ul>
  11. 11. The Plotter <ul><li>A plotter produces its output using special pens across the paper to create a drawing. Engineers, architects and designers use plotters to produce their drawings or designs. </li></ul><ul><li>The Microfilm </li></ul><ul><li>The computer can also output its data on film. A microfilm is a film available in the form of reels while card-sized sheets are called microfiche. Large amounts of data can be stored this way. </li></ul>

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