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WELCOME

EVALUATION

INTRODUCTION

PROCESS AND

RESOURCES

TASK

TEACHERS PAGE

CONCLUSION BIBLIOGRAPHY

WELCOME

Thank you for your interest in coming to class,

and thank you for being early and fully

Prepared. I urge your full attention,

participation and support in our class discussion

and activities.

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INTRODUCTION

Lets read

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My poor little grandmother have been around the computer for hours. She has been typing and

researching but guess what!! she has no idea of how to get the material in a tangible

form. Oh no!!! my grandma is getting so irritated. Thanks to the use of output devices her day will

be saved. Let us tell grandma what output devices are, the different types and how they can

be categorized to get her information on tangible materials.

TASK

You are required to help your grandmother to

fully understand what is meant by the term

output devices, identify for her the types of

output devices used on a daily basis and

categorize the different types into hardcopy

and softcopy.

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PROCESS/RESOURCES

In your groups you are required to do the

following:

Procedure 1: In your groups you are both

required to look at the definition of output

device.

Procedure 2: Each member of the group is

required to choose a type of out put device

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and analyze what it is and see which

category of hardcopy or softcopy it fits.

Procedure 3: You are required to make your own

notes for further references.

Procedure 4: At the end of your research, the

different groups will be asked to present to the

class their findings in any creative way of their

choice.

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Procedure 5: click on this link to access a

resource sheet with the definition, types, and

the categories of output devices.

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Output devices are pieces of computer hardware

that allow a computer system to communicate

information to a user or another system. This

information can be in any form, and includes

sound, images, and even tactile experiences.

Output devices can usually only be used to send

data from the computer; items called input

devices allow users and other systems to send

data to the computer. Output devices of

computer are types

of peripheral hardware connected to the

computer either using cables or over a wireless

network. An output given by the computer can

be in the form of a display on the screen or a

printed document or a song that is played.

Immaterial of whether you have desktop

computers, laptop computers or

supercomputers, you will require at least one

output device.

Monitor

A monitor is also called video display terminal

(VDT). The users can view the visual display of the

processed data on the monitor. Computer

monitors come in a variety of screen sizes and not

to forget, visual resolutions. All monitors have a

video card, which processes the data into images,

to be eventually displayed. Cathode Ray Tube

(CRT) and flat panel displays are the two types of

monitors

CRTs are cheaper, and have good viewing

angle. They are also bulkier and consume more

power. On the other hand, the flat panel

displays have no magnetic interference and

lighter. They are also costlier.

Computer Display (Monitors)

A computer display is also called a display

screen or video display terminal (VDT). A

monitor is a screen used to display the

output. Images are represented on monitors by

individual dots called pixels. A pixel is the

smallest unit on the screen that can be turned on

and off or made different shades. The density of

the dots determines the clarity of the images,

the resolution.

Screen resolution: This is the degree of

sharpness of a displayed character or image.

The screen resolution is usually expressed as

the number of columns by the number rows. A

1024x768 resolution means that it has 1024 dots

in a line and 768 lines. A smaller screen looks

sharper on the same resolution. Another

measure of display resolution is a dot pitch.

Interlaced/Non-interlaced: An interlaced

technique refreshes the lines of the screen by

exposing all odd lines first then all even lines

next. A non-interlaced technology that is

developed later refreshes all the lines on the

screen form top to bottom. The non- interlaced

method gives more stable video display than

interlaced method. It also requires twice as much

signal information as interlaced technology.

There are two forms of display: cathode-ray

tubes (CRTs) and flat-panel display.

Cathode Ray Tubes (CRT)

A CRT is a vacuum tube used as a display screen

for a computer output device. Although the CRT

means only a tube, it usually refers to all

monitors. IBM and IBM compatible

microcomputers operate two modes unlike

Macintosh based entirely on graphics mode.

They are a text mode and a graphics mode.

Application programs switch computers into

appropriate display mode.

Flat Panel Displays

Portable computers such as a lap top use flat

panel displays, because they are more compact

and consume less power than CRTs. Portable

computers use several kinds of flat panel

screens:

EVALUATION

Your performance will be evaluated based on

how authentic your research is and how

creative you deliver the content to the rest of

the class.

Rubric:

Students collaboration 3marks

Content 5marks

Creativity 3marks

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CONCLUSION

Based on the WebQuest that you have read,

please copy and complete the following

questions in your note books. This will assist

me in determining how much you have grasped

or understand output devices.

What is an output device?

List three (3) types of output devices.

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Output devices provides either _________ output or _________ output.

List one output device that produce hardcopy and one that produce softcopy.

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TEACHERS PAGE

Title: "An Output Devices WebQuest"

Author: Melecia Facey

Contact: meleciafacey@yahoo.com

Course: Information Technology

Topic: This WebQuest can be used in any

introduction to computer class. It was designed

for middle/high school students to be used in

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conjunction with teaching the fundamentals of

computer hardware and software devices.

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BIBLIOGRAPHY

http://teachlogy.wordpress.com/lesson/Output-

devices/group discussion

http://www.teachict.com/gcse_computing/ocr/

212_computing_hardware/output_devices/quiz

/invaders_output.htm

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CREDITS

All images on the WebQuest were

obtained at http://google.com/images.

Director

Kereen Tatham

Head of Department

Isaac Onywere

Presenter

Melecia Facey

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