Though computer based projectors are the most popular types of projectors,
they still can be very expensive. This simply means that it still is no
match for overhead projectors. Bringing out the beauty of overhead
projectors would depend if the user knows how to effectively use and manage
Benefits of the Overhead Projectors
Overhead projectors have a lot of different advantages that would
definitely outdo other visual aids. For example, lecturers can make use of
a projector the same way as they could use blackboard. But the biggest
benefit that you can get from it would be for you to be able to keep an eye
on your class while lecturing.
As a teacher, being able to keep an eye to keep an eye on your students is
very essential in both expository and facilitative teaching. It also serves
as a means of outward way of non-verbal conversation for the lecturer and a
means of receiving comments from the students about how bad or good the
Another essential advantage that overhead projectors have over traditional
blackboards is that it can be used for different purposes and it can be
used to show off pre-prepared contents. This allows lecturers and teachers
to build diagrams, tables, notes and other materials. All of these can be
present repeatedly at anytime.
If overhead projectors are designed and installed properly, it can give all
the cues and aids that are essential during any presentations. This would
also eliminate the need for you to manually take notes. Overhead
transparencies are also very compact and very convenient to carry with
compared to other types of visual aids such as charts where it can easily
get crumpled and damaged.
Overhead projectors also have another notable advantage over other visual
aids. And that is it does require not require your room to be dark, which
will allow students to take notes without any problem. It can be used in
any environment as long as it is not hit with direct sunlight or extreme
They are also very easy to use, clean, and quiet and needs no technical
skills or knowledge for a user to operate it.
Weaknesses of the Overhead Projectors
Some drawbacks of projectors would include the fact that it needs constant
electric supply and would need a while flat surface so the images could be
projected. Another notable disadvantage of this is if the surface is not
correctly inclined at the correct angle, your images will suffer from
Unlike traditional blackboards and whiteboards, overhead projectors would
need some maintenance. These are likely to break and crack, so you should
always be very careful at handling it and at least keep a spare bulb.
Another disadvantage of projectors is that some lecturers would find the
glare coming from the projector to be bothersome.
Aside from the mentioned disadvantages, another disadvantage of overhead
projectors is that if the users do not pay close attention to their
material, they may look very untidy when presented. It may be hard for the
audience to read the texts that is presented on the projector.
Overhead projectors can be very heavy and bulky which makes it very
inconvenient to travel with. Contents from books also cannot be displayed
effectively without making any modifications since they may tend to be
unreadable. Lastly, the bulbs of projectors would cost you a big amount of
money if you want to replace it. A bulb would normally you cost around $150
to $400 a piece.
Knowing all of the mentioned advantage and disadvantages would be very
helpful especially if you’re considering get yourself a projector that you
can use in the office or a classroom.
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