Output devices

Output devices

1. Monitor

   • display graphics, text and video
   • 3 types
     • monochrome
     • grey scale
     • colour
       • AKA RGB - 3 separate signals: red, blue and green
         • picture made up of dots - pixels
   • made of glass- fragile
   • Laptops have LCD (Liquid Crystal Display)

2. Printers

   • 3 types
     • Inkjet
       • Relatively cheap to buy
       • Slower than laser (4 pages/min)
       • Expensive running costs - replacing cartridges
     • Laser
       • High-quality outputs
       • Fast speed (10 pages/min)
       • Expensive toner catridges
       • Running costs cheaper, but expensive to buy
       • quiet in operation
     • Dot matrix
       • Cheapest printer
       • Low running costs
       • Slow
       • Noisy
       • Lower quality output
   • Problems
     • Out of paper
     • Paper Jam
     • Out of Ink
     • Off-Line

3. Plotter

   • produces diagrams on paper
   • Drawings are of good quality on large size paper
   • Slower and more expansive than printers

4. Speakers

   • Headphones or speakers
   • High-quality speakers are expensive
   • needed for programs requiring sound