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:
a. Identify output devices from a pictures displayed
b. Suggest a suitable use of output devices
c. 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:
1. CRT- cathode Ray Tube,
2. Flat-Screen and
3. 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:
1. Impact and
2. Non-impact
Impact printers: Impact printers operate by having an element strike
the paper.
Examples:
1. Dot-Matrix Printers
2. Daisy-Wheel Printer
3. Drum Printer
4. Chain printer
5. Band printers
6. Line Printer
7. Wire matrix printer
8. 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:
1. LaserJet printer
2. inkjet printer
3. 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
HeaterBuzzerMotor
Pump

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

11. WORD LIST