JSS2 Basic Science Lesson Note on Application of Conduction; Convection and Radiation

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TOPIC: THERMAL ENERGY

SUB-TOPIC: APPLICATION OF CONDUCTION, CONVECTION AND RADIATION.

Geothermal Energy Plant

Geothermal energy plants generate electricity and heat by harnessing the heat energy contained within the earth. The earth transfers its energy to deep-lying circulating water, which the plants access with wells and pumps. Geothermal energy is attractive because it has a low impact on the environment; however, there are few sites where geothermal energy can be extracted economically.

APPLICATION OF CONDUCTION

1. Heat conduction is applied in cooking with metal pot e.g. Aluminum pots.
2. Ironing of clothes with pressing iron
3. Welding of two iron metals together.
4. The handles of the cooking utensils are made of materials like plastic and sometimes wood which cannot conduct heat when carried by the cook;
5. Woolen clothes which prevent body from losing heat to the surrounding are worn during cold;
6. Thatch-roofed homes feel cooler inside than houses covered with iron sheet because iron conducts heat.

APPLICATION OF CONVECTION

1. Land and sea breezes are phenomena based on convection of air.
2. Cooling of the car engine is by convection.
3. Heating of water through heater
4. Freezing of food and drinks
5. Cooling of homes by air conditioners

APPLICATION OF RADIATION

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