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kaitof
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............................................ bài đọc chụp thiếu bài đọc Solar energy is a long lasting source for energy which can be used almost anywhere. To generate solar energy, we only need solar cells and the sun! Solar cells can easy be installed on house roofs, so no new space is need and each user can quietly generate their own energy. Compared to other renewable source, they also possess many advantages. Wind and water power rely on turbines which are noisy, expensive and easy to break down. Solar cells are totally silent and non-pollution. As they have no moving parts, they require little maintenance and have a long lifetime. However, solar energy also has some advantages. We can only generate solar energy during daytime because the system depends on sunlight. Besides, solar cells require large area work effectively. The main disadvantage of solar energy is that it costs about second as much as traditional sources such as coal, oil, and gas. This is because solar cells are expensive. Scientist are hoping that the costs of solar cells will reduced as more and more people see the advantages of this environmental friendly source of energy.

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