Advantages & disadvantages chalkboard,overhead projector.

This ppt contain advantages and disadvantages of chalkboard and over head projector

1. WELCOME

2. Advantages And Disadvantages of Chalkboard , Overhead projector Present by: Suchitra Shantaram Poskar . Khare Dhere Bhosale College,Guhagar

3. ChalkBoard :- A chalkboard is a dark- coloured board that you can write on with chalk. Chalkboards are often used by  teachers in the  classroom. This medium include a large writing area,a writing substance (usually chalk),and an eraser Chalkboard is usually green/ black,for writing on with chalk

4. Advantages of Chalkboard The chalkboard is inexpensive, especially when the usable life of the board is considered. You can easily add or erase if you committed error or you forgot to write about the topic. In showing solutions of the different mathematical problems , chalkboard is very useful to show it systematically. Various colored chalk or pens can be used to develop the topic, show parts or build associations

5. Advantages of Chalkboard The teacher can illustrate/ draw figures and highlight these drawings by using colored chalks. Using chalkboard, the students can improve their handwriting/ penmanship Through chalkboard, the students can improve or develop their thinking ability and visualize their own ideas. Face to face contact with audience Face to face contact with audience Face to face contact with audience Face to face contact with audience Face to face contact with audience Face to face contact with audience Face to face contact with audience Face to face contact with audience is possible Face to face contact with audience 2x+3x=145 Sin (90)=? Various colored chalk or pens can be used

6. Disadvantages of Chalkboard You cannot save the writings/ visual materials posted on the board. With a short height may not be able to use the chalkboard in a maximum way. The writing on chalkboards is difficult to read in the dark. Chalkboard is not applicable in dark areas and is not appropriate for students having visual impairments. It cannot show motion to discuss a process. Log 3 (3.5578)=??? Log 5(856.132245)=4654.124

7. Disadvantages of Chalkboard It can cause misconception or misunderstanding if it is not used properly. Chalkboard work can be messy (dirty). Chalkboard is that the information written on the board is temporary We can’t illustrate maps, chemical reactions, mathematical formulas and complex diagrams on board.  Chalk produces dust,it causes allergy and asthma problems. Chalk sticks are broken easily , it causes many problem. Area of circle is=?

8. Overhead Projector An  overhead projector is a very basic but reliable tool used to display images onto a screen or wall. Overhead projectors were used during World War II as a tool to train groups of servicemen.  In the 1950s and '60s, it crossed over into the classroom as an educational tool, and then into the business world as a training tool. It is better medium than chalkboard

9. Advantages of Overhead projector Face to face contact with audience Eye contact possible Can pick up verbal and nonverbal Projector located in front of room and near speaker for easy access Effective in a fully-lighted room; audience can follow handouts or take notes Presentation can use again and again Highlighting important points with transparency pen

10. Advantages of Overhead projector It shows motions such as pictures , videos , audios,etc We can fouse the audience when presenting the presentation It is better than chalkboard In OHP , file can easy store and transport i.e. share OHP uses LCD,DVD show the presentation

11. Disadvantages of Overhead projector Overhead projector is bulky and heavy to transport. OHP is very expensive than chalkboard. It requires power supply. It need suitable flat surface on which to project its image. It is advice not to move immediately as soon as lamp is switched off. It can cause rainbow effect on LCD . It can cause screen door effects.

12. Comparison between chalkboard and overhead projector Chalkboard is ineffective than OHP. OHP is easy to understand than chalkboard. OHP is very costly but chalkboard is easily get as well as it is profitabally . Using OHP , adiences can visualize the presentation but in chalkboard medium user can mistake when writing on board. OHP is better than Chalkboard.

13. THANK YOU