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Disadvantages Of The Overhead Projector

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• The overhead projector (OHP) OHP is still retains a unique versatility as a teaching aid. Anything can set on overhead transparencies: we can show whole texts or grammar exercise, picture, students’ writing, etc. One of the major advantages of overhead projector is that we don’t have to show everything on an OHT all at once. We can cover some of the transparencies with paper or card, and we can blank out what we don’t want the students to see. Even overhead projectors are versatile they still pose some problems, too. They need electricity, of course, and bulbs do fail from time to time. When images projected onto shiny surfaces, they can be uncomfortable to look at, and it can be very difficult to make out details.
• The flip chart Flip chart works best in two particular situations. First, a teacher, group leader or group scribe stand at the flip chart and records the points that are being made. Second, the participant – because they can see what is being written up – can then ask for changes to be made. Students can walk around the classroom seeing what the different groups have written when an activity is finished.
• Computer-based presentation technology …show more content…

The two crucial pieces of hardware are a computer and a data projector. Anything on our computer screen can be shown to the whole class using data projector to put up an enlarged version of it on screen or white wall. One of the major technological developments in the last a few years has been the interactive whiteboard (IWB). The advantages of IWB, first, teachers and students can write on the board that the images are being projected onto, and they can be manipulated images on the board. Second, what appears on the board can be saved or printed so that anything written up or being shown there can be looked at again (Dudeney & Hockly, 2007:

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