"Energy" Energy and Sustainable Development PPT Courseware 4 Simple campus recruitment activity planning plan summary enterprise and institution recruitment publicity lecture PPT template is a general PPT template for business post competition provided by the manuscript PPT, simple campus recruitment activity planning plan summary enterprise and institution recruitment promotion Lecture PPT template, you can edit and modify the text and pictures in the source file by downloading the source file. If you want more exquisite business PPT templates, you can come to grid resource. Doug resource PPT, massive PPT template slide material download, we only make high-quality PPT templates!
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Authoritative PPT Summary
"Energy" Energy and Sustainable Development PPT Courseware 4
1. Energy concept
1. Definition: Any material resource that can provide energy is called energy.
The smelting of metals, the operation of machines, and the movement of vehicles such as cars and trains require energy. Energy is also required in daily life such as cooking, heating, and lighting.
The energy utilized in production and life is provided by different energy sources. The extensive utilization of various energy sources has greatly promoted the development of human civilization.
2. The history of human energy utilization
The emergence of the technology of drilling wood to make fire has enabled mankind to realize the transition from using natural fire to using artificial fire. It started an era in which humans relied on firewood as their main energy source.
Firewood is mainly obtained through deforestation. Large-scale deforestation seriously damages the ecological balance of the earth. At the same time, due to the low efficiency of burning firewood to obtain energy, humans still need to develop other energy sources.
The invention of the steam engine allowed humans to successfully convert internal energy obtained from combustion into mechanical energy. A new era has been realized in which mechanical power replaces human and animal power on a large scale. The main energy source of mankind has shifted from firewood to coal with higher calorific value.
Coal, oil, and natural gas were formed from animals and plants buried underground millions of years ago over a long period of geological time, so they are called fossil energy. These three energy sources are the three pillars of primary energy in the world today.
3. Types of energy
1. Energy that can be obtained directly from nature is called primary energy
2. Energy obtained by processing primary energy is called secondary energy
4. Energy trends in the 21st century
If the world's energy consumption is converted into standard coal with a calorific value of 2.93×107 J/kg, it was 2.6 billion tons in 1950, more than 11 billion tons in 1987, close to 14 billion tons in 2003, and reached 16 billion tons.
Fossil energy is the main energy source required by modern human civilization. Since it is a non-renewable resource, it will eventually be used up.
Moreover, accidental damage to the environment during the mining of fossil energy is also very serious. Therefore, developing new energy sources and making better use of known energy sources are important issues on a global scale.
In the 1940s, scientists invented the nuclear reactor, a device that can control the release of nuclear energy, which kicked off the use of new energy represented by nuclear energy.
Principles of nuclear power generation
1. The nuclear reactor is surrounded by a thick concrete cover to absorb radiation.
2. Water circulates in the center of the nuclear reactor, absorbs the heat generated in the nuclear reaction, and transfers this internal energy to the water in the steam generator
3. Water that has absorbed heat vaporizes into steam
4. The steam drives the generator to operate, converting the mechanical energy of the steam into electrical energy.
Class summary
1. Energy is used to provide energy in people's production and life.
2. The energy used by mankind in history has gradually changed from the sun, firewood, etc. to fossil energy such as coal, oil, and natural gas.
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