Classification of energy sources

Energy can be classified into three broad categories according to its source:?

(1) Energy from the sun. Including direct energy from the sun (such as solar thermal radiation) and indirect energy from the sun (such as coal, oil, natural gas, oil shale and other combustible minerals and biomass, such as fuelwood, hydroelectric energy and wind energy, etc.).

(2) Energy from the Earth itself. One is the geothermal energy contained within the Earth, such as underground hot water, underground steam, dry hot rock bodies; the other is the atomic nuclear energy contained in the Earth's crust, such as uranium, thorium and other nuclear fuel.

(3) Energy generated by the gravitational pull of celestial bodies such as the Moon and the Sun on the Earth, such as tidal energy.

Subtitle Answer:

Water energy is classified as energy from the sun. Hydraulic energy refers to the gravitational potential energy of water, which is also known as the barrage dam of a hydroelectric power plant, where water is first held back so that the surface of the water is elevated and its gravitational potential energy is accumulated, and then a conduit channel is opened at a lower position in the dam to direct the water to hit the water wheel blades of a generator, which first converts the gravitational potential energy into the kinetic energy of the water flow, and then pushes the generator to convert it into electrical energy.

Water is alpine ice and snow melt water or surface water through the accumulation of the formation of rivers, snow and ice and surface water from atmospheric precipitation, atmospheric precipitation from the evaporation of rivers, lakes and oceans, while the evaporation of water is due to the sun's radiant heat. So it is said that water energy is energy from the sun.

Expanded Information:

There are many different types of energy sources, and through human development and research, more new types of energy sources have begun to meet the needs of humans.

Source classification:

①Energy from celestial bodies outside the Earth (mainly solar energy).

In addition to direct radiation, and provides the basis for the generation of wind, water, bioenergy and fossil energy, etc.. The vast majority of mankind's energy requirements come directly or indirectly from the sun.

It is the various plants that convert solar energy into chemical energy stored in the plant through photosynthesis. Fossil fuels such as coal, oil, and natural gas were also formed by ancient plants and animals buried in the ground over long geologic ages. They are essentially solar energy fixed by ancient organisms. In addition, water energy, wind energy, wave energy, and ocean current energy are also converted from solar energy.

②The energy contained in the earth itself.

Usually refers to the energy related to the thermal energy within the Earth and the energy related to atomic nuclear reactions, such as atomic nuclear energy, geothermal energy, etc.. Hot springs and magma spewed out by volcanic eruptions are manifestations of geothermal heat.

The Earth can be divided into three layers: the crust, the mantle and the core, which is a large heat reservoir. The crust is the layer on the surface of the Earth, usually ranging from a few kilometers to 70 kilometers thick. Below the crust is the mantle, which is mostly molten magma and is 2,900 kilometers thick. Volcanic eruptions are usually eruptions of this magma. Inside the Earth is the core, which has a temperature of 2,000 degrees at its center. It can be seen, the earth's geothermal resources storage is also very large.

3 Earth and other celestial bodies interact with the energy generated, such as tidal energy.

Energy resources are the basis for energy development. Since the founding of New China, it has continuously increased the exploration of energy resources and organized many resource evaluations. China's energy resources have the following characteristics:

-The total amount of energy resources is relatively abundant. China has relatively abundant fossil energy resources, of which coal dominates. Among them, coal plays a dominant role; in 2006, the reserved coal resources amounted to 1,034.5 billion tons, and the remaining proved recoverable reserves accounted for about 13% of the world's total, ranking the third in the world.

Proven oil and natural gas resources reserves are relatively insufficient, and oil shale, coalbed methane and other unconventional fossil energy reserves have greater potential. China has relatively rich renewable energy resources. The theoretical reserves of hydropower resources amount to 6.19 trillion kilowatt-hours (kWh) of annual power generation, and the economically exploitable annual power generation is about 1.76 trillion kWh, which is equivalent to 12% of the world's hydropower resources, ranking first in the world.

-Capita energy resources ownership is low. China has a large population, and its per capita ownership of energy resources is at a low level in the world. The per capita amount of coal and hydropower resources is equivalent to 50% of the world average, while the per capita amount of oil and natural gas resources is only about 1/15 of the world average. Arable land resources are less than 30% of the world's per capita level, restricting the development of biomass energy.

-Energy resources are unevenly distributed. China's energy resources are widely but unevenly distributed. Coal resources are mainly located in North China and Northwest China, hydropower resources are mainly located in Southwest China, and petroleum and natural gas resources are mainly located in East, Central and West China and the sea.

China's major energy-consuming regions are concentrated in the economically developed areas along the southeast coast, and there is an obvious difference between resource endowment and energy-consuming regions. Large-scale and long-distance transportation of coal from the north to the south, oil from the north to the south, gas from the west to the east, and electricity from the west to the east are the distinctive features of China's energy flow and the basic pattern of energy transportation.

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