Output devices

A monitor displays text and image data passed to it by the computer.

1. Thursday, October 27, 2016 Output devices

2. Learning outcomes : At the end of the lesson, i should be able to do the following: Identify output devices from a pictures displayed Suggest a suitable use of output devices State advantages and disadvantages of output devices

3. Monitor/visual display unit ( vdu ) A monitor displays text and image data passed to it by the computer. Three types of monitors are identified: CRT- cathode Ray Tube, Flat-Screen and Multimedia projector. Cathode ray tube (CRT) (TFT)–Thin-Film-Transistor; or (LCD)–Liquid-Crystal Display. Digital / Multimedia Projector

4. Printers Printers produce a hard copy version of document of file. There are basically two kinds of printers: Impact and Non-impact Impact printers: Impact printers operate by having an element strike the paper. Examples: Dot-Matrix Printers Daisy-Wheel Printer Drum Printer Chain printer Band printers Line Printer Wire matrix printer Wang image printer

5. Impact printers

6. Non-impact printer: A type of printer that does not operate by striking a head/element against a ribbon/carbon. Examples: LaserJet printer inkjet printer Thermal printer LaserJet Inkjet Thermal

7. PLOTER A plotter is a computer printing device for printing vector graphics. Plotters differ from printers in that they draw lines using a pen . In general, plotters are considerably more expensive than printers. They are used in engineering and architectural applications where precision is mandatory.

8. Actuators An actuator is a device, controlled by a computer, that can affect the real-world. Actuators are used extensively in computer control systems . Actuators and what they can do: Actuator What it Can Do Light bulb or LED Creates light Heater Increases temperature Cooling Unit Decreases temperature Motor Spins things around Pump Pushes water / air through pipes Buzzer/Bell / Siren Creates noise

9. Actuators Lights Heater Buzzer Motor Pump

10. Assignment Outline the advantages of Non-impact printers over impact printers. In a tabular form, compare and contrast LaserJet with Inkjet printers. [ use the internet if need be ] Read up the topic: system unit

11. Word list