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Unit Two: Energy • Touch the glass of the bulb after asking your teacher. • What do you observe? ................................... • Conclusion: ........................................................... In the electric lamp; electric energy is converted into light energy and heat energy. ‫ب‬::‫ﺗﺪرﻳـــ‬ Exercise

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Attention • Don’t touch glass bulb of light lamp in home while it is on, because it is of a very high temperature.

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Battery of 3 volts

Switch Some wire segments

Electric lamp

Electric bell

Use the materials and objects shown above to set a tool to let a deaf friend has attention, also to set another tool for the same purpose for a friend who can not see. Activity

4 (Energy transformations)

On operating a car engine, several transformations of energy take place. Mention some of these transformations ……............................................. Inside the car: • Fuel stores chemical energy which burning inside the car and is converted into heat energy which produces mechanical energy that causes the car to move. • The electric generator (dynamo) converts a part of mechanical energy into electric energy. • A Part of electric energy is converted into light energy in the car lamps. • Another Part of electric energy is converted into sound energy of the car in the radio cassette. • A third part of the electric energy is converted into heat energy once again in the heater of the air conditioning of the car and so on.

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Science - Explore & Learn

First Grade Preparatory

Science book prep 1 first term  

science

Science book prep 1 first term  

science

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