-An LCD projector is a type
of video projector for displaying video, images or computer data on a
screen or other flat surface.
-Because they use small
lamps and the ability to project an image on any flat surface, LCD projectors
tend to be smaller and more portable than some other types of projection
systems. Even so, the best image quality is found using a blank white, grey, or
black (which blocks reflected ambient light) surface, so dedicated projection
screens are often used.
Advantages
of LCD Projectors
Ø
Cost
of LCD Projectors
Ø
Sharp
Images
Ø
Greater
Zoom Magnification
Ø
Less
Power Consumption
Disadvantages
of LCD projectors
Ø
Limited
lifetime
Ø
Contrast
Ø
Screen-door
effect
Ø
Dust
issues
Ø
Dead
pixels
The
Chalkboard
A chalkboard is a reusable writing surface on
which text or drawings are made with sticks of calcium
sulfate or calcium carbonate, known, when used for this purpose, as
chalk.
Except in extremely deprived
classrooms, every classroom has a chalkboard. In fact, a school may have no
computer, radio, tv, etc. but it will
always have a chalkboard.
Practices that help us in effective use of
Chalkboard
2. Have a hard copy
of your chalkboard diagram or outline.
3. Do not crowd your
notes on the board.
4. Make use of
colored chalk to highlight key points. Color will also make your board work
appealing.
5. Do not turn your
back to your class while you write on the chalkboard. Write side view as you
talk. Do not lose your eye contact with the class.
6. For the sake of
order and clarity, start to write from the left side of the board going right.
7. If you teach the
grades and you think the lines on the chalkboard are needed for writing
exercise, then provide the lines for your board.
8. Look at your board work
from all corners of the room to test if pupils from all sides of the room can
read your board work.
9. If there is glare on the
chalkboard at a certain times, a curtain on the window may solve the problem.
10. If you need to
replace your chalkboard or if you are having a new classroom with new
chalkboard suggest to the carpenter to mount the chalkboard a little concave
from left to right to avoid glare for the pupils’ benefit.
11. If you need to
have a board work in advance or that need to be saved for tomorrow’s use(say a
quiz or sophisticated diagram), write “Please Save” and cover the same with a
curtain.
12. Make full use of
the chalkboard. It may be a traditional educational technology but it serves
its purpose very well when used correctly.
Chalkboard Techniques
By: James W. Brown (1969)
A.
Sharpen
your chalk to get good line quality.
B.
Stand
with your elbow high. Move along as you write.
C.
Use dots as “aiming points”. This keeps
writing level.
D.
Make
all writing or printing between 2 and 4 inches high for legibility.
E.
When
using colored chalk, use soft chalk so that it can be erased easily.
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