Lesson Plan
Course Title: Computer Maintenance
Session Title: What does “CRT” stand for?
Lesson Duration: Will vary from instructor to instructor.
Performance Objective:
Upon completion of this lesson, the learner will possess a broad knowledge of
Cathode Ray Tubes.
Specific Objectives:
• Define CRT (Cathode Ray Tube)
• Research and explain contributions to the development of the CRT
• Define terms associated with CRTs
• Identify the components of a PC monitor
Preparation
TEKS Correlations:
130.273(c)(1)(F)(H)(I)
(1) The student demonstrates the necessary skills for career development,
employability, and successful completion of course outcomes. The student is expected
to:
(F) demonstrate leadership skills and function effectively as a team member;
(H) demonstrate an understanding of legal and ethical responsibilities in relation to
the field of information technology;
(I) demonstrate planning and time-management skills such as project management
and storyboarding.
130.273(c)(4)(E)(G)(H)
(4) The student acquires an understanding of computer technologies. The student is
expected to:
(E) differentiate among digital, analog, and input and output electronics theory;
(G) describe the architecture of various computer systems;
(H) describe the function of computer components such as central processing units,
storage devices, and peripheral devices;
130.273(c)(5)(B)
(5) The student knows the proper function and application of the tools, equipment, and
materials used in computer technologies. The student is expected to:
(B) employ available reference documentation such as tools, materials, and Internet
sources to access information as needed;
Instructor/Trainer
References:
• http://aip.org/history/electron/jjhome.htm
IT: Computer Maintenance: CRT Plan
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• http://www.nobel.se/physics/laureates/1906/
• http://britannica.com/nobel/micro/591_84.html
• http://www.corrosion-doctors.org/Biographies/ThomsonBio.htm
Instructional Aids:
1. CRT PowerPoint Presentation
2. Research Paper Guidelines/Evaluation Rubric
3. PPT Presentation Guidelines/Evaluation Rubric
4. CRT Exam
5. CRT Exam Key
Materials Needed:
1. Containers
2. Clean work area
Equipment Needed:
1. Computers with Internet access and MS PowerPoint software for student
use
2. 17-21” CRT monitor
3. Computer tool kit
4. Antistatic wrist strap
Learner
Prior to this lesson, the learner should have knowledge of Microsoft PowerPoint
software, internet research techniques, and search engines.
Introduction
MI
Introduction (LSI Quadrant I):
SAY: The PC has changed our lives and the way in which we work and
play. One of the least thought about, yet most critical, components
of the system is the monitor.
ASK:Where did it come from? How did it evolve?
SAY: This lesson will answer those questions and more.
Outline
MI
Outline (LSI Quadrant II):
Instructor Notes:
I. Define CRT
A. Cathode Ray Tube – provides the
space for electron beams to project an
image large enough to fill the screen of
a monitor
II. Research/explain the contributions of JJ
Thomson to CRT development.
A. Overview of copyright ethics and
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plagiarism
1. Define plagiarism.
2. All references (websites, books,
articles, etc.) must be documented
(cited).
3. Any direct quotes should be
placed in quotation marks; the
author’s last name and the page
number where the quote can be
found in the source should be
provided in the student’s work.
B. Arrange to use the school library.
C. Make arrangements for a librarian to
provide students with an overview of the
library system and policies.
D. Arrange to use a computer lab.
III. Create a class PowerPoint Presentation.
(Maximum of 20 slides)
A. Summarizing the information from each
team’s paper
IV. Define terms associated with CRTs
A. Video input – an image transmitted from
another source via a video or media
card
B. VGA – video graphics array; a cable
that delivers the video input signal from
the source to the monitor; one end of
the cable must be plugged into the
source and the other end into the
monitor.
C. Cathode – a negatively charged
electrode that releases a steady supply
of electrons to an electron gun.
D. Electron gun – attracts the electrons
and then shoots the invisible electrons
toward the back of the screen to create
the images seen on the face of the tube
E. Deflection yoke – helps guide the
electron beams in creating the images
F. Electron beams – sent toward
phosphors behind a screen; the density
of the beams affects the consistency of
the pixel appearance.
G. Pixel – the smallest part of an image
that a monitor or printer can control;
each pixel is comprised of 3 phosphors
(red, blue, green); “pixel” is derived from
IT: Computer Maintenance: CRT Plan
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the term “picture element” which can
also be abbreviated as PEL.
H. Phosphors – dots that glow and
produce a visible image
V. Identify the components of a monitor.
A. The teacher will display a diagram of a
monitor and label each component:
1. VGA
2. Cathode
3. Electron Gun
4. Deflection Yoke
5. CRT
6. Screen
Application
MI
Guided Practice (LSI Quadrant III):
Research/explain the contributions of JJ Thomson to CRT development.
1. Group students into 5 teams.
2. Assign each team one of the electronic references listed in the
references section of the lesson plan.
3. Distribute the Research Paper Guidelines/Evaluation Rubrics.
4. Discuss the assignment parameters.
5. Students work in teams/pairs to complete their research.
6. Compile the collected data into a team paper (rough draft).
7. Rotate the papers around the teams for peer review and editing.
8. Submit the edited drafts for teacher feedback.
MI
Independent Practice (LSI Quadrant III):
1. Teams refine papers based on the feedback from peers and the
teacher.
2. Finished papers are to be turned in prior to the Class Presentation.
3. All students collaborate on a class PowerPoint presentation that
summarizes the information from each team’s research paper.
Summary
MI
Review (LSI Quadrants I and IV):
Rhetorical question: Did you know?
The original CRT, designed by Philo T Farnsworth, helped bring television
into millions of homes across America. The small screen of the first
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television sets found their way into use with the first computing machines
(such as the Kaypro and Compaq Portables). These portable PCs did not
have a hard drive and, used 5¼” floppy disks to store data and simple
programs. The portables weighed about 40 pounds each and cost almost
$8,000 to purchase.
Evaluation
MI
Informal Assessment (LSI Quadrant III):
The teacher monitors individual/group progress as students work on
activities. The teacher provides individual help/redirection as needed.
MI
Formal Assessment (LSI Quadrant III, IV):
•
•
•
Teams research papers.
PPT presentation summarizing research findings.
Use the CRT exam and CRT exam key to test student learning of the
lesson concepts.
Extension
MI
Extension/Enrichment (LSI Quadrant IV):
•
Have students investigate the safety methods and guidelines used
during the disassembly and handling of a CRT monitor. Caution the
students that actually opening a monitor can be deadly if the safety
procedures are not followed exactly.
•
If available, have the individual parts of a CRT monitor accessible to
the students. To ensure student safety, disable all the components.
Make sure that they are properly discharged and cannot be recharged.
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Icon
MI
Verbal/
Linguistic
Logical/
Mathematical
Visual/Spatial
Musical/
Rhythmic
Bodily/
Kinesthetic
Intrapersonal
Interpersonal
Naturalist
Existentialist
IT: Computer Maintenance: CRT Plan
Teaching Strategies
Personal Development
Strategies
Lecture, discussion, journal
writing, cooperative learning,
word origins
Reading, highlighting, outlining,
teaching others, reciting information
Problem-solving, number
games, critical thinking,
classifying and organizing,
Socratic questioning
Mind-mapping, reflective
time, graphic organizers,
color-coding systems,
drawings, designs, video,
DVD, charts, maps
Use music, compose songs
or raps, use musical
language or metaphors
Organizing material logically, explaining
things sequentially, finding patterns,
developing systems, outlining, charting,
graphing, analyzing information
Developing graphic organizers, mindmapping, charting, graphing, organizing
with color, mental imagery (drawing in
the mind’s eye)
Use manipulatives, hand
signals, pantomime, real life
situations, puzzles and board
games, activities, roleplaying, action problems
Reflective teaching,
interviews, reflective listening,
KWL charts
Cooperative learning, roleplaying, group brainstorming,
cross-cultural interactions
Natural objects as
manipulatives and as a
background for learning
Socratic questions, real-life
situations, global
problems/questions
Creating rhythms out of words, creating
rhythms with instruments, playing an
instrument, putting words to existing
songs
Moving while learning, pacing while
reciting, acting out scripts of material,
designing games, moving fingers under
words while reading
Reflecting on the personal meaning of
information, studying in quiet settings,
imagining experiments, visualizing
information, journaling
Studying in a group, discussing
information, using flash cards with
others, teaching others
Connecting with nature, forming study
groups with like-minded people
Considering the personal relationship to
the larger context
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CRT Research
Name _________________________ Date ______________________
CRT Exam
PART 1 DIRECTIONS: Match the following terms on the right with the definitions on the left.
Record the letter that corresponds to the term in the blank space beside the appropriate
definition. (90 points)
1.
An image transmitted from another source via video
or media card.
2.
Video graphics cable that delivers the video input
signal from the source to the monitor; one end of the
cable must be plugged into the source and the other
end into the monitor.
A. Cathode
B. CRT
3.
Negatively charged electrode that releases a steady
supply of electrons to an electron gun.
4.
Attracts the electrons and then shoots the invisible
electrons toward the back of the screen to create
the images seen on the face of the tube.
C. Deflection yoke
D. Electron beams
E. Electron gun
F. Phosphors
G. Pixel
H. VGA
5.
Helps guide the electron beams in creating the
images.
6.
Sent toward phosphors behind a screen; the density
of the beams affects the consistency of the pixel
appearance.
7.
The smallest part of an image that a monitor or
printer can control; each pixel is comprised of 3
phosphors (red, blue, green); it is derived
from the term “picture element,” which can also be
abbreviated as PEL.
8.
Dots that glow and produce a visible image.
9.
Cathode Ray Tube.
I. Video input
PART 2 DIRECTIONS: In the space provided below, and on the back of this paper, briefly
summarize the contributions of JJ Thomson to the development of the CRT (Cathode Ray
Tube). (10 points)
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CRT Exam - KEY
PART 1 DIRECTIONS: Match the following terms on the right with the definitions on the left.
Record the letter that corresponds to the term in the blank space beside the appropriate
definition. (90 points)
I
1.
An image transmitted from another source via video
or media card.
H
2.
Video graphics cable that delivers the video input
signal from the source to the monitor; one end of the
cable must be plugged into the source and the other
end into the monitor.
A. Cathode
B. CRT
A
3.
Negatively charged electrode that releases a steady
supply of electrons to an electron gun.
E
4.
Attracts the electrons and then shoots the invisible
electrons toward the back of the screen to create
the images seen on the face of the tube.
C. Deflection yoke
D. Electron beams
E. Electron gun
F. Phosphors
G. Pixel
H. VGA
C
5.
Helps guide the electron beams in creating the
images.
D
6.
Sent toward phosphors behind a screen; the density
of the beams affects the consistency of the pixel
appearance.
G
7.
The smallest part of an image that a monitor or
printer can control; each pixel is comprised of 3
phosphors (red, blue, green); it is derived
from the term “picture element,” which can also be
abbreviated as PEL.
F
8.
Dots that glow and produce a visible image.
B
9.
Cathode Ray Tube.
I. Video input
PART 2 DIRECTIONS: In the space provided below, and on the back of this paper, briefly
summarize the contributions of JJ Thomson to the development of the CRT (Cathode Ray
Tube). (10 points)
Determine an appropriate response based on the information contained in the PPT presentation
created by the students.
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Paper Evaluation Rubric
Team Name / Student Names:
_________________________________
_________________________________
_________________________________
_________________________________
_________________________________
Assessment Criteria
Completeness – All elements are
addressed
• Overview of Thomson’s life
• Career Achievements
• CRT contributions
• Photograph
• References
Comprehensiveness – Topic
thoroughly discussed
• Overview of Thomson’s life
1. Early years
2. Schooling
3. Career goals
• Outline and discussion of
major career achievements
• Contribution to CRT
development
References – Evidence of use of
minimum required references
• 2 Websites
• 2 Books
References – Citation of references
according to established standards
• Quotations
• Photographs
• References section
Mechanics – Writing free from
grammar, spelling, and punctuation
errors
Points
Available
10
Points
Earned
Comments
60
10
10
10
Total:
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CRT PowerPoint Presentation Evaluation Rubric
Team Name / Student Names:
_________________________________
_________________________________
_________________________________
_________________________________
_________________________________
_________________________________
Points
Assessment Criteria
Available
Completeness – All elements are addressed 5
• Overview of Thomson’s life
• Career Achievements
• CRT contributions
• Photograph
• References
55
Comprehensiveness – Topic thoroughly
discussed
• Overview of Thomson’s life
1. Early years
2. Schooling
3. Career goals
• Outline and discussion of major
career achievements
• Contribution to CRT development
References – Evidence of use of minimum
required references
• 5 Websites
• 5 Books
References – Citation of references
according to established standards
• Quotations
• Photographs
• References section
Organization – Logical
organization/progression of slides
Design – Effective use of PPT tools
• Visual layout, color composition, and
balance.
• Slide
transitions/animation/music/audio
• Number of slides
• Timing of the slide transitions
Mechanics – Presentation free from
grammar, spelling, and punctuation errors
Points
Earned
Comments
5
5
10
15
5
Total:
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