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Cho bạn nào có câu hỏi giống mình mà vẫn chưa tìm được câu trả lời. Solar energy brings us both benefits and drawbacks. One of the biggest advantages is that it is a renewable energy source. Energy can be produced as the sun lasts forever. Therefore, solar energy can really be called as a long- term energy source. Furthermore, that is a non- energy source of pollutants such as zero carbon dioxide or other gases in electricity generation. Beside those benefits, solar energy also has some drawbacks. The initial installation cost of solar cells is quite high, so not all people can use it. Also, it can not effectively work in cold weather due to the scarcity of sunlight. In conclusion, we can't deny the advantages of solar energy, but it still exists some disadvantages.
Solar energy makes us have solar electricity, light to live. If you don't have solar energy, you will have to use electricity, but using electricity will cause a fire, so solar energy is very good.
Energy is very important in our daily life. We use energy for almost everything we do. However energy is limited. We should do the following things to save energy. Firstly, we should use electricity more efficiently. Secondly, we had better reduce our electricity bills. Besides, it’s necessary to turn off the lights when leaving a room or before going to bed to save energy. Moreover, we ought to reduce the use of fossil fuels. In short, we should try our best to save energy for our future and for our planet’s future.
Television is a breakthrough invention of human, however, it has both advantages and drawbacks. First, take a look at its benefits. TV is a huge source of information with a wide variety news and instruction channels. You now can learn through TV and update news about what is happening in the world. Television also provides a huge knowledge of many fields including natural science, social science,… Besides, Television is a common type of entertainment thanks to a wide range of music TV programs, cartoons, reality shows or funny programs. On the other hand, television has some outstanding disadvantages. In fact, many people become addicted to Television and turn it on all day. Especially to children, they don’t want to go out to play with friends or focus on study. They just sk their eyes to the screen without wanting to leave. Some programs even contain violent and criminal content, which influence negatively on children. Also, spending hours watching TV is harmful to your eyesight and wasting your time. With that amount of time, you can do something more beneficial such as playing sports, doing physical exercises or learning new skills. In summary, nowadays, television is indispensable and its benefits outweigh its drawbacks.
Dịch
Ti vi là một phát minh đột phá của con người, tuy nhiên, nó có cả lợi thế và hạn chế. Trước tiên, hãy nhìn vào các lợi ích của nó. TV là một nguồn thông tin khổng lồ với nhiều kênh tin tức và kênh hướng dẫn. Bây giờ bạn có thể học qua TV và cập nhật tin tức về những gì đang xảy ra trên thế giới. TV cũng cung cấp nhiều kiến thức về nhiều lĩnh vực như khoa học tự nhiên, khoa học xã hội, ... Bên cạnh đó, truyền hình là một loại hình giải trí phổ biến nhờ vào một loạt các chương trình truyền hình âm nhạc, phim hoạt hình, chương trình thực tế hay các chương trình hài hước. Mặt khác, truyền hình có một số bất lợi lớn. Trên thực tế, nhiều người trở nên nghiện tivi và bật nó cả ngày. Đặc biệt đối với trẻ em, chúng không muốn đi chơi với bạn bè hoặc tập trung vào việc học tập. Chúng chỉ dán mắt vào màn hình mà không muốn rời đi. Một số chương trình thậm chí còn chứa nội dung bạo lực và tội phạm, ảnh hưởng tiêu cực đến trẻ em. Đồng thời, dùng hàng giờ để xem TV có hại cho thị lực của bạn và lãng phí thời gian của bạn. Với khoảng thời gian đó, bạn có thể làm điều gì đó có lợi hơn như chơi thể thao, tập thể dục hoặc học các kỹ năng mới. Tóm lại, ngày nay, TV là không thể thiếu và lợi ích của nó lớn hơn những hạn chế của nó.
TK
Solar energy brings us both benefits and drawbacks. One of the biggest advantages is that it is a renewable energy source. Energy can be produced as the sun lasts forever. Therefore, solar energy can really be called as a long- term energy source. Furthermore, that is a non- energy source of pollutants such as zero carbon dioxide or other gases in electricity generation. Beside those benefits, solar energy also has some drawbacks. The initial installation cost of solar cells is quite high, so not all people can use it. Also, it can not effectively work in cold weather due to the scarcity of sunlight. In conclusion, we can't deny the advantages of solar energy, but it still exists some disadvantages.
Tham khảo
Energy is very important in our daily life. We use energy for almost everything we do. However energy is limited. We should do the following things to save energy. Firstly, we should use electricity more efficiently. Secondly, we had better reduce our electricity bills. Besides, it’s necessary to turn off the lights when leaving a room or before going to bed to save energy. Moreover, we ought to reduce the use of fossil fuels. In short, we should try our best to save energy for our future and for our planet’s future.
Currently English is very common in Vietnam. It helps us in communication as well as learn the language of England. Not only learning, listening and writing, but now we can rely on is the book to learn more words. Reading will help us to better understanding and use of the correct and reasonably so. Also, if we know how to read, it will be beneficial for us to read and understand it as well. Do not despise reading, do not think that reading is not and does not help then you are wrong, it helps to be much like to study later on you will not be shy in communicating with them and will also not ashamed of talking.
The book is written in the language system, namely the written word constantly linked together to form sentences, lines, paragraphs, all ... The word is used always meant, and means that the definition is referred to the corresponding things in life. Examples mentioned 'still life' we think of a variety of utensils or fruit is placed in a state of calm, said to 'orbit' we think of a set of points that make up a closed path for for the movement of a certain entity, or mention 'Leopard' we think of many wings flowers, blooming in the spring, beautiful, and people like to enjoy ... Thus, the process is essentially reading is a process of observing things and phenomena in real life, but writing was conventional process through symbolic imagination, think.
Then when the association also arise when you compare the problems have been reading in this book and other books, in the opinion of this person others, the same or different, why is there such similarities and differences ... imagination rich, deep thinking, combined with the quest to discover the motivation will help you formulate creative energy, think of something new, find new ones and thereby make new ones.
Solar energy collected on Earth is the energy of the stream of electromagnetic radiation coming from the Sun to Earth. We will continue to receive this stream of energy until the nuclear reaction on the Sun runs out of fuel, about 5 billion years from now.
This energy can be obtained directly through the photoelectric effect, which converts the solar photons energy into electricity, as in the solar cell. The energy of the photons can also be absorbed to heat objects, i.e. convert to heat, used for solar water heaters, or boil water in the solar tower's thermoelectric machines, or heat systems such as solar air conditioners.
The energy of the photons can be absorbed and converted into energy in the chemical bonds of photochemical reactions.
A natural photochemical reaction is photosynthesis. This process is thought to have stored solar energy in non-renewable fossil fuel sources that the industries of the nineteenth to twenty-first centuries had been making use of. It is also the process that energizes all natural biological activities, for livestock traction and firewood, traditional renewable bioenergy sources. In the future, this process could help create renewable energy sources in biofuels, such as liquid fuels (biodiesel, vegetable oil fuel), gas (biogas) or solid. .
Solar energy is also absorbed by the Earth's hydrosphere and Earth's atmosphere to produce meteorological phenomena containing exploitable forms of energy reserves. The Earth, in this energy model, resembles the water heater of the early heat engines, converting the heat absorbed from the Sun's photons into the kinetic energy of the currents of water, steam and air. , and alter the chemical and physical properties of these flows.
The potential of rainwater can be stored in dams and run the generator of hydroelectric plants. One form of making use of the energy from rivers and streams that existed before hydroelectricity was the water mill. The currents of the sea can also move the generator of a power plant using the currents of the sea.
The flow of the air, or wind, can generate electricity by turning a wind turbine. Before wind power generators were introduced, windmills were used to grind grain. Wind energy also causes wave motion across the sea surface. This movement can be utilized in power plants using waves.
Oceans on Earth have a greater specific heat than air and therefore change temperature more slowly than air when absorbing the same heat of the Sun. The ocean is hotter than air at night and colder than air during the day. This difference in temperature can be exploited to run heat engines in power plants that use the heat of the sea.
When the absorbed heat from the Sun's photons evaporates the seawater, some of that energy is stored in separating the salt from the salt water of the sea. The power plant uses the reaction of fresh water - salt water reclaim this energy when it brings fresh water from the river back to the sea.
n our daily life, energy play a very important role, so we should save energy. I think there are many ways to save energy and now I will share with you some ways to save energy effectively. Firstly, we should turn off all the electric appliances when we don't use them such as: lights, fans, air conditioner...… Secondly, we can use solar energy or wind energy instead of electric energy in our house. It will help us save more money. Thirdly, we can go to school or go to work on foot, by bike or by public transport instead of motorbike or car. By these ways, the energy will be saved.
Bài dịch
Trong cuộc sống hằng ngày của chúng ta, năng lượng đóng một vai trò vô cùng quan trọng, vì thế chúng ta nên tiết kiệm năng lượng. Tôi nghĩ có nhiều cách tiết kiệm năng lượng và bây giờ tôi sẽ chia sẻ với các bạn một số cách tiết kiệm hiệu quả. Đầu tiên, chúng ta nên tắt tất cả những thiết bị điện khi không sử dụng như đèn, quạt, điều hòa…. Thứ 2, chúng ta có thể sử dụng năng lượng mặt trời hay năng lượng gió thay cho điện ở trong nhà của chúng ta. Nó sẽ giúp chúng ta tiết kiệm được rất nhiều tiền. Thứ 3, thay vì đi ô tô hay xe máy, chúng ta có thể đi bộ đi học hoặc đi làm. Bằng những cách này, chúng ta có thể tiết kiệm được rất nhiều năng lượng.
I am a volunteer so I have done many things for the community service. Last month, I raised money and funds for the poor, and they were very hapy. I also donated books and clothes for the children. Last week, I provided houses and food for the homless, and they looked very happy, too. So far, I , and my classmates, have planted trees and beautiful flowers in the school yard. It was so great. I have collected the rubbish on the beach and in the sea then I recycle them. It helps protectthe environment. And I, together with my family, often go to the hospital to help every one there. They are so freindly and they seem very happy when they see us. Volunteering is very good and special to me 'cause I can help others. I 'll do more in the future.
Tham khảo
Volunteer is nowadays a kind of community activity that attracts a large number of attendants from different age group on the basis of its huge advantages. In the first place, voluntary work provides adolescents many precious opportunities to develop social skills, foster independence and form the ability to deal with difficulties in different situations. Simultaneously, every member will be taught how to work in a team, the way to make conversation or the responsibility of finishing a task. The experience you gain will be valuable for your future, and, hence tackles serious problems in later life and ameliorates your quality of work. In addition, volunteer requires us kindness, determination, flexibility and a sense of moral responsibility to adapt to something new, thus improving our character as well as our ability. What is more, you can widen your relationship by making new friends through regular activities of clubs or organizations. You can also have a chance to travel more, have great adventures, approach something new or explore more interesting things you have not experienced before. In conclusion, the number of people applying for voluntary work has been on the increase in recent years and in the future, this figure is expected to rise higher when more people can realize profound effects of volunteering on the lives of individuals.
Advantages of renewable energy
The first advantage of renewable energy is that it can be renewable, has an extremely large reserve, can be endless. Forms of energy such as solar, wind, geothermal, ocean waves, rain... are available and free to use, without fuel costs. Biomass energy also has large reserves and low fuel costs. Compared to traditional energy sources such as coal, oil, natural gas, which are increasingly depleted, only meeting human energy needs for about 50-70 years, this advantage is a strength. outstanding.
The second advantage of renewable energy is that it is abundant and can be widely exploited in all different areas of the earth. For example, with solar energy, people can exploit it anywhere, as long as there is sunlight, it can be used to generate heat to make hot water, heating, and generating electricity through the system. Solar power with solar panels… Or with wind energy, this energy source has been used for hundreds of years to move sailing boats, hot air balloons, windmills for irrigation systems. … or the current trend is to produce electricity from wind in many countries around the world.
Despite many great advantages, renewable energy also has some disadvantages, such as:
Due to the influence of nature, renewable energy is less stable than traditional energy sources. Solar energy can only be exploited during the day on sunny days, and at night or on cloudy and rainy days, the system will not work. Or with wind energy, wind turbines can only generate electricity at times when the wind speed is in the range of 4-25 m/s. Wind speed must be at least 4 m/s for the wind turbines to start running smoothly and generate electricity, but if it exceeds 25 m/s, the turbines will stop working to avoid damage in windy conditions. strong.
Requires advanced technology and high cost is also a drawback of renewable energy. To take advantage of renewable energy sources to generate electricity, it requires advanced technology and relatively high investment costs. Currently, the cost of electricity generation from renewable energy is generally higher than the cost from fossil energy. However, the development of renewable energy in the global trend has helped to reduce costs and increase efficiency, gradually improving this shortcoming.