شرح ساينس الصف الرابع الابتدائي لغات - الفصل الدراسي الثاني
شرح ساينس رابعة ابتدائي - ترم ثاني

لينك تحميل الملزمة
https://drive.google.com/file/d/1VDv4EnTPPpvVywC-_9t-GTVki24AS6tT/view?usp=sharing

لينك تليجرام
https://t.me/mrahmedelbashagroup

In This Lesson:
Windmills and watermills:
- Hundreds of years ago, people needed machines to make their lives easier,
For example, they used windmills and watermills which helped them to grind grain to make flour.
- The following table shows the energy used in windmills and watermills as well as the advantages and disadvantages of each :


Old mills and modern turbines:

Solar energy :
• The energy coming from the Sun is called "solar energy", which contains light and thermal energies from the Sun.
• The solar energy that is produced by the Sun contains a type of energy called
"radiant energy" or "radiation" which is found in the sun rays.

Uses of solar energy :
Direct source of thermal energy
Solar energy can be used directly as a source of thermal energy when exposing yourself to the Sun to feel warm.

In warming houses
Houses can be built in a way that enables the energy of the Sun to warm them by placing large windows on the walls that face the Sun for most of the day.

In greenhouses
-Greenhouses are used to plant the crops that only grow in warm climate.
- Greenhouses allow the entry of solar energy (especially radiant energy), then this radiant energy is converted into thermal energy that warms the inside of the greenhouses.

In cooking food
Where, convergent mirrors (concave mirrors) are used to collect and focus sunlight (sun rays) to heat metal pots and cook the food inside.
• Convergent (concave) mirrors are curved mirrors are curved mirrors as shown in the opposite picture.

Solar water heater
• It consists of panels made of black pipes can be placed on the roof of houses.
• It is used to heat the water when it passes through these pipes, then the heated water is stored in a water tank to be used later.


بالتوفيق
مستر احمد الباشا