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External Hardware (Input Devices (Keyboard (They are used to input the…

- - - - Text
      - Numbers
      - Instructions
      - Data into applications
      - Enter commands
    - - They also come with a hand rest which helps prevents health problems such as RSI
  - - - Optical Mouse
        
        Uses reflected light to detect movement
      - Ball mouse
        
        Uses a ball to detect movement
      - Both allow the user to control an on-direct pointer
        
        They have 2 buttons and a scroll wheel with different functions
        
        Left button: select icons and click options
        
        Advantages of a mouse
        
        Faster to select icons
        
        Very easy to move the pointer around the screen
        
        They don't take much space
        
        Disadvantages of a mouse
        
        People with wrist or hand problems can find it painful
        
        They can pick up dirt which affects the accuracy of the mouse
        
        They need a flat surface
        
        Right button: show a drop-down menu of options
        
        Scroll wheel: move up and down through a document
      - There are also cordless or wireless mouse that work using batteries and without wires
        
        Touchpad: It's a replacement for a mouse on laptops. Users slightly brush over the touchpad to move the cursor. The buttons and the functions are the same as the mouse
  - - - It works by reflecting light off the hard copy in order to capture an analogue image of the document
        
        You can store it in the computer and edit it with a photo editing software
    - - Very fast to enter hard copies
      - Very easy to scan and store documents in the computer
      - Photos that are damaged can be repaired by scanning it into the computer and editing in a photo editing software
- - - - Each pixel is made up of 3 transitors: red, green and blue and they produce different intensities
      - A black light is used to shine light to these transitors
        
        In order to light a little pixel, tiny windows open and close to allow the light to pass through and onto the pixel
    - - It is lightweight
      - It is very thin
      - It produces much less glare than CRT monitors
    - - Images can be unclear
      - Lower picture quality compared to a CRT
      - Cannot be used with light pens
  - - - They work by using a laser beam to "draw" onto a drum
        
        The toner is sprayed onto the drum and it sticks to the parts that contains the positive electric change
        
        The drum is pressed onto a sheet of paper and then it gets heated so the toner sticks to the paper