Chapter 2A

Chapter 2A

1. scanner

   • e.g. barcode
     • reads the barcodes and translates the bars into numbers
   • barcodes are used to identify a product
     • e.g. products in supermarkets, so stocks and prices can be analysed
   • translatesinformation intoaformthe computercan use

2. mouse

   • it has buttons on the top to make theselections
   • a mouse is a pointing device that can be used to select items on the screen
   • it has a sensor underneath which allows the pointer (cursor) to move on the screen following the physical movement of the mouse

3. keyboards

   • keyboards are good for importing small amounts of data
   • a keyboard has a set of letters and numbers and may also have a calculator like numerical keyboard
   • a typewriter - like set of keys that are used to input data and control commands to the computer

4. input devices

   • important to choose the most appropriate
   • determined by the cost
   • gets data from outside the computer into the computer system