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TT
31 tháng 3 2021
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.
NT
1
2
5 tháng 5 2021
Nowadays, energy is being run out more and more so it is one of the most important things of our life. We need to save energy because nobody of us can lives without energy. So why don't we start to do it right in our home? We have many ways to save energy in our home. One of those ways is using electricity, water and gas economically. Such as we should turn off the light in room when we go out or in unnecessary situations, avoid wasting water, shut the kitchen stove when stop cooking. Use a microwave instead of a stove to reheat food. Use rechargeable batteries instead of disposable batteries... Besides, we should use electrical equipments which are energy - saving. Such as using lights and fans that have low capacity, or using equipments which reserve electricty. Not only do these help us to save money but also they work effectively.
In addition, we should frequently check electrical equipments in our home in order to fix opportunely. In summary, we need to save energy so that energy isn't run out and continues to serve human's life.
HQ
Hà Quang Minh
Giáo viên
9 tháng 10 2023
A: What are the advantages of energy from coal?
(Ưu điểm của năng lượng từ than đá là gì?)
B: It's cheap and easy to use.
(Nó rẻ và dễ sử dụng.)
A: What are its disadvantages?
(Nhược điểm của nó là gì?)
B: It's limited and not good for the environment.
(Nó hạn chế và không tốt cho môi trường.)
30 tháng 3 2023
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.
11 tháng 5 2017
| Sources of energy | Advantage (s) | Disadvantage (s) |
| Wind |
abundant safe |
not always available |
| Solar |
renewabale safe clean plentiful |
expensive |
| water/hydro |
clean safe unlimited |
expensive not available |
| biogas |
renewable available clean, safe |
hamful polluting |
| nuclear |
renewable clean |
expensive dangerous |
| coal/oil/natural gas | abundant |
hamful exhaustible polluting |
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ko thể tái tạo lại được sau khi đã sử dụng
nếu như dùng lãng phí quá thì nguồn năng lượng ko tái tạo sẽ vĩnh viễn "bay khỏi trái đất"
đắt, làm ô nhiễm môi trường