Reference Answers:
1 (1) Environment-friendly and pollution-free; (2) Inexhaustible and inexhaustible (3) Low development cost and broad prospects; (As long as the meaning is correct, 3 points)
2 Use specific data to show that solar energy resources are very abundant. (The meaning is correct, 2 points)
3 "One" indicates that solar energy is one of the "renewable energy sources which can not only obtain energy, but also reduce emissions of harmful gases and harmful substances. like carbon dioxide. » Furthermore, there are other energy sources that also exhibit this characteristic. (The above meaning is correct. 3 points)
What do you think about the solar power plant floating in space in sixth grade science?
After a careful study, scientists discovered that sunlight When it passes through the atmosphere and reaches theOn the Earth's surface, about 1/3 of the light energy is reflected back into space. Consequently, the solar energy received above the atmosphere can be more than 4 times greater than that received on the ground. As a result, scientists came up with a bold idea: to build solar power plants in space.
To this end, the solar energy satellite carrying the solar power plant must be sent into a geosynchronous orbit 36,000 kilometers above the ground. The time it takes for a satellite to circle the Earth is exactly the same as the time it takes for the Earth to complete one rotation, which is 24 hours.
The electric satellite is equipped with huge solar panels, which can directly convert solar energy into electrical energy, convert electrical energy into microwave energy and send it back to the ground, the receiving station on the ground uses a giant; antenna to retransmit this microwave energy converted into energyelectrical engineering.
Now that humans have mastered space technology, it is no longer a dream to build various space solar power plants with power generation capacities ranging from 2,500 megawatts to 10,000 megawatts. The United States launched one in the early 1970s. built an electric satellite equipped with 147,840 solar cells, capable of producing 11.5 kilowatts of electricity. It is similar to another solar power generation device with a power generation capacity of 11.3 kilowatts installed on the “Apollo” spacecraft.
Of course, some technical difficulties remain when building large-scale space solar power plants. For example, a space plant with a power generation capacity of 10 million kilowatts requires a solar panel area of 64 square kilometers; at the same time, an array antenna that sends microwave energy to theground also requires an area of 64 square kilometers; 64 square kilometers. About 2 square kilometers. In addition, for high-power satellites, they must be disassembled, transported to space, then assembled and once the satellite is installed, it must be maintained and inspected regularly; In this way, it is necessary to have special transportation vehicles like the space shuttle that can travel between earth and space.
This whole series of problems still requires efforts from scientists to resolve them further.
The principle of solar energy production is as follows: Substances can be divided into: conductors, semiconductors and insulators based on their conductivity. From the point of view of the internal structure of matter, the conductivity of matter is caused by the movement of electrons. If all energy levels inside a substance are filledof electrons, thenThe electrons will then no longer have room to move and they will not conduct electricity, which is an insulator.