The document discusses various output devices for computers including monitors, printers, plotters, and actuators. It provides details on the different types of monitors, printers, and their functions. Impact printers operate by striking an element against the paper while non-impact printers do not require contact. Laserjet and inkjet printers are examples of non-impact printers. Plotters are used for printing vector graphics and differ from printers in that they draw lines using pens. Actuators are computer-controlled devices that can affect the real world, with examples being lights, heaters, motors and pumps.

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