| A. Solar energy can be obtained directly from nature and is a primary energy source, it can be obtained continuously from nature and is a source of 'renewable energy, so A is correct;< p>B. Nuclear energy is obtained directly from nature and is a primary energy source; however, it cannot be replenished from nature in the short term and is a non-renewable energy source, so B is wrong; C. Oil is obtained directly from nature. What is obtained is primary energy; that which cannot be replenished from nature in the short term is non-renewable energy, so C is false; D. Natural gas is obtained directly from nature and constitutes a primary energy source; it cannot be replenished in the short term. Energy replenished from nature is non-renewable energy, so D is false. Then choose A. |
What are the differences between primary energy and secondary energy?
According to the classification of production energy < /strong>, which can be divided into primary energy and secondary energy. Among them, electrical energy is a secondary energy source; Both nuclear energy and solar energy are primary energy sources. That is to say, electrical energy is an energy product that must be converted from the processing of primary energy. Primary energy can be obtained directly from nature.
According to the classification of energy properties, it can be divided into combustible energy and non-combustible energy. WhereElectric energy can be either a fuel-based or non-fuel energy source (depending on how it is produced). Both nuclear energy and solar energy ares non-combustible energy sources.
According to the classification of energy pollution, it can be divided into polluting energy and clean energy. Electric energy can be either clean or polluting (depending on how it is produced). Both nuclear power and solar power are clean energy sources.
Conversion between energy production:
1. Different forms of energy can be converted into each other. Among the primary energy sources, wind, water, ocean currents and waves are based. Mechanical energy (kinetic energy and potential energy) is supplied in the form of and can be converted into energy or electricity using various wind (such as wind turbines) and hydraulic (such as water turbines) machines.
2. Conventional energy sources such as coal, oil and natural gasl generally convert the chemical energy of combustion into thermal energy by combustion.
3. Thermal energy can be used directly, but a large part of thermal energy is converted into electricity through various types of thermal machines (such as internal combustion engines, steam turbines and gas turbines, etc.) operate various types of machinery and transportation tools on the job; or drive a generator to send electricity to meet the needs of people's lives and industrial and agricultural production.
4. The energy required for electricity generation and transportation represents a large proportion of total energy consumption. It is predicted that by the end of the 20th century, energy demand for electricity production alone will exceed that of the primary sector. 40% of energy development. The higher the proportion of primary energy converted into electricity,the higher the degree of electrification, the more advanced productivity and the higher the standard of living.
Reference for the content above? Baidu Encyclopedia - Energy
Primary energy includes: crude coal, crude oil, natural gas, nuclear energy, solar energy, hydropower, energy wind power, wave energy, tidal energy, geothermal energy, biomass energy and ocean temperature difference energy, etc.
Secondary energy includes: electricity, steam, gas, gasoline, diesel, heavy fuel oil, liquefied petroleum gas, alcohol, biogas, hydrogen and coke, etc.
Primary energy can be divided into two categories: renewable energy and non-renewable energy. Renewable energy includes solar energy, hydropower, wind energy, biomass energy, wave energy, tidal energy, different energynce of ocean temperature, etc. They can be recycled into nature, while non-renewable energy sources include: coal, crude oil, natural gas, oil shale, nuclear energy, etc. The more they are used, the less they will be.
Primary energy, also known as natural energy, refers to energy obtained from nature and used directly without modification or transformation. Such as raw coal, crude oil, natural gas, hydroelectric power, wind power, solar power, ocean power, tidal power, geothermal power, natural uranium ore , etc. Primary energy is divided into renewable energy and non-renewable energy. The first refers to natural energy that can be produced repeatedly, including solar energy, wind energy, tidal energy, geothermal energy, etc. ; various fuels fossil and nuclear fuels.
Primary energy refers to energy extracted from nature and used directly. This is the energy contained in natural resources (such as coal, crude oil, sunlight, uranium, etc.) that has not been transformed or converted by humans. .
Secondary energy refers to the energy obtained after processing and converting primary energy, including electric energy, gasoline, diesel, liquefied petroleum gas and hydrogen energy. Secondary energy can be divided into "processing energy" and "energy energy". Electric energy is the most widely used processing energy, while gasoline and diesel are currently the most widely used energy energy.
Secondary energy can also be interpreted as energy that is reused as primary energy. For example, burning coal to produce steameur can power a generator, and the electricity generated can be called secondary energy.
Secondary energy is different from primary energy. It does not come directly from nature, but can only be obtained after processing and conversion of primary energy. Therefore, strictly speaking, it is not an “energy” but should be. called “secondary energy”. The energy crisis, renewable energies, etc. do not involve secondary energy.
Reference materials:
Baidu Encyclopedia: What are primary energy and secondary energy?