There are basically three ways to use solar energy directly:
1. Solar energy is directly converted into thermal energy (i.e. “light-heat” conversion );
2. Solar energy is directly converted into electrical energy (i.e. “light to electricity” conversion);
3. Solar energy is directly converted into chemical energy (i.e. “photochemical” conversion).
What are the aspects of direct use of solar energy by humans?
① Light-heat conversion, solar water heater is a device that converts the solar energy into internal energy, and it belongs to photothermal conversion, so ① is consistent with:
②Conversion of light into electricity. Solar calculators convert solar energy into electrical energy. Solar cars convert solar energy into electrical energy, so ②. is consistent;
③Light--Chemical energy conversion, green plant growth is the conversion of solar energy into chemical energy, which belongs to photochemical conversion, so ③ is consistent with; >④Light-biomass energy conversion. Biomass energy utilization technology uses animal and plant energy substances to form energy which is fixed in the form of biomass by the energy of solar radiation through the photosynthesis of green plants. This is the most important way for humans to use solar energy indirectly, so ④ is consistent;
So choose D.
How to use solar energy directly
Fossil fuels such as coal, oil and natural gas provide us with a large amount of energy. At present, there are two ways for people to use solar energy directly: one is to directly collect solar energy andconvert into internal energy, and the other is to use solar cells to convert solar energy into electrical energy.
So the answer is: fossil fuels, solar energy.
There are several methods as follows
Photovoltaic cells can directly convert solar energy into electric energy, including solar cars, solar street lights, etc.
Seawater desalination can use solar energy to evaporate seawater, collect water vapor and condense it into fresh water, and the remaining minerals can be sold as table salt after treatment.
Heating using solar energy. energy to heat homes, particularly suitable for areas with sufficient sunlight in winter.
As for the use of solar energy by various plants for photosynthesis, it does not belong to direct use.