...Introduction – Education at present is in a flux. The system of Education at all level has changed, is changing & will continue to change as and when it is required. There is an agreement on all sides that the academic education is to be replaced by practical & dynamic education which is related to life. The main account in modern education is on the awaking of curiosity, the stimulation of creativity, the development of proper interests, attitudes & values & the builing of essential skills such as independent study & capacity to think and judge for oneself. In modern education, students are encouraged to explore, to ask questions, to study themselves & to be creative. In this modern education audio-visual aids are more important because in modern teaching- learning process 85% of teaching is related to the audio visual aids. It is now established that audio -visual aids work as potent initiators. In the past the teacher was considered to be the soverign as far as the teaching -learning process was concerned. The role of the students was mostly passive. Modern trends have changed the face of educational world. Many progressive methods have come in the wake of these trends. Yet the traditional methods are not being given up altogether, they are “being modified and adjusted to the changed concepts and situations.” Multimedia Approach & Instructional Development – Educational Technology can be called systematic...
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...Chapter 1 INTRODUCTION The project ‘Heat Transfer Studies on a 7.5 Watt LED Lighting Load using Finite Element Analysis’ is mainly concerned with the heat generated by an LED lighting load and its dissipation to the surrounding such that the LED junction temperature is maintained low. The LED chosen for this project is 7.5 Watt, which has a maximum operating temperature of around 80°C, exceeding which the LED will fail. The LED is best operated at room temperature conditions and may be just above. The project implements a specific method of cooling or rather maintaining the LED junction temperature as low as possible by using a Thermo Electric Cooling device, more specifically known as the Peltier device. The project looks into the various methods by which a Peltier cooler can be implemented such as, with or without a fan or simply a fan would provide sufficient cooling for the LED module. A Heat sink is a necessary component which is always associated with cooling electronic components. Before getting into the depth of the project detailing we will look into the basic components that have been used in the project setup which include: a. LED Module b. Peltier Cooler c. Heat Sink d. Cooling Fan 1.1 Light Emitting Diode: Light-emitting diodes (LEDs) are small but powerful devices in terms of their diverse applications. LED lights assume greater significance in the context of need for electrical energy conservation and pollution control world over. LED is basically...
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