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

لينك تحميل الملزمة
https://drive.google.com/file/d/1aQFJ9F_UvOq61Ti9FBYRmmpW0Q1NIPTv/view?usp=sharing

لينك تليجرام
https://t.me/mrahmedelbashagroup

In This Lesson:
Solar panels
Solar panels can be very small that they can supply only one light bulb with energy,
or very large that they can supply buildings or cities with energy.
► How do solar panels work?
• Solar panels are composed of many small solar cells.
• These cells capture solar energy (especially radiant energy) coming from the Sun and convert it directly into electrical energy.
• Solar panels are used to generate electricity.

Uses of electricity generated by solar panels.
• This electricity can be used directly to light the streets.
• This electricity is used to recharge some types of batteries, like some calculators with small solar cells.
•This electricity is used in houses to operate various electric devices.
• This electricity is used to operate irrigation equipment in some villages .


 
Using energy of the wind
Different amounts of solar energy (especially radiant energy) reach different regions of the world.


Radiant energy causes the air around the globe to heat up to different degrees, where the difference in temperature between cold and hot air causes air to move and wind to blow.


• Kinetic energy of the wind movement is used to rotate (spin) the blades of wind turbines.
• When the blades of wind turbines rotate, this causes the rotation of turbines.
• Turbines operate the generators that convert kinetic energy into electrical energy.

This electrical energy is transmitted through big wires to different places such as houses and factories .

The following diagram shows the energy chain of the wind turbines:

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