"Development and Utilization of Energy" Energy, Materials and Society PPT Courseware 3

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"Development and Utilization of Energy" Energy, Materials and Society PPT Courseware 3

New knowledge exploration

1. Energy and Society

Energy: If an object can do work on the outside, we say that the object has energy. (Such as mechanical energy, internal energy, electrical energy, etc.)

Energy: refers to material resources that produce energy for human use. (Such as coal, oil, natural gas, etc., they burn to produce energy, so they are energy sources.)

Classification of energy

1. Energy is divided according to whether it can be used directly:

Primary energy: energy that can be taken directly from nature. Such as coal, oil, natural gas

Secondary energy: energy converted through processing. Such as electric energy, gasoline, alcohol (the "favorite" of secondary energy - electric energy)

2. Energy is divided according to whether it can be recycled or regenerated:

Non-renewable energy: Once consumed, it cannot be added again. Such as coal, oil, and natural gas, which were formed by ancient organisms during long-term geological changes.

Renewable energy: energy that will not diminish with development and utilization. Such as solar energy, water energy, wind energy, geothermal energy, ocean energy, tidal energy, this type of energy can be continuously obtained in nature.

2. Energy and environment

1. Greenhouse effect

The greenhouse effect, also known as the "greenhouse effect", is the common name for the atmospheric insulation effect. The atmosphere can make the short-wave radiation of the sun reach the ground, but the long-wave thermal radiation emitted from the surface is absorbed by the atmosphere, which increases the temperature of the surface and lower atmosphere. Because it functions like a greenhouse for cultivating crops, it is called the greenhouse effect.

Reduce greenhouse effect

In order to reduce excessive carbon dioxide in the atmosphere, on the one hand, people need to save electricity as much as possible (because coal is burned for power generation) and drive less cars; on the earth, plankton in the ocean and forests on land can absorb a large amount of carbon dioxide, especially in the tropics. rainforest. Therefore, on the other hand, we must protect the forests and oceans, such as not deforestation and pollution of the oceans to protect the survival of plankton. We can also protect green plants by planting trees, reducing the use of disposable wooden chopsticks, saving paper (wood used for papermaking), and not trampling on lawns, so that they can absorb more carbon dioxide to help slow down the greenhouse effect.

3. Develop new energy sources

With the growth of economy and population, my country's energy demand is also increasing. Total primary energy consumption increased from 602.75 million tons of standard coal in 1980 to 1.31557 billion tons of standard coal in 1996. Energy consumption is dominated by coal. Coal consumption increased from 610 million tons in 1980 to 1.388 billion tons in 1996, an increase of nearly 1.27 times.

According to statistics from the International Energy Agency, the oil, natural gas, and coal on the earth can only be mined by humans for 40 years, 50 years, and 240 years respectively. At present, more than 90% of the world's energy consumption is non-renewable energy, of which oil accounts for about 40%, coal accounts for about 35%, and natural gas accounts for about 20%.

Think about it: Based on the above-mentioned current situation of our country’s energy resources, do you think there may be an “energy crisis” in our country? Facing the energy crisis, what should we middle school students do?

Solar energy - the eternal source of power

Reading and discussion

What is the significance and value of human development of solar energy?

Through what channels is solar energy absorbed and utilized by life on earth?

What are the current technologies for humans to utilize solar energy?

What are the advantages and disadvantages of solar energy?

What are the four main channels through which the earth absorbs and utilizes solar energy?

1. Absorbed by plant microorganisms

2. Make the atmosphere and water rise and circulate

3. Absorbed by the ocean

4. Direct use

nuclear energy

1. What is nuclear energy?

2. What are the two ways to release nuclear energy?

3. What is nuclear fission? Chain reaction?

4. How does a nuclear power plant work?

5. What are the advantages of nuclear power plants?

(1) Nuclear energy concept:

The huge energy contained inside the nucleus is called nuclear energy, or nuclear energy for short.

(2) There are two ways to release nuclear energy:

1. Nuclear fission

2. Nuclear fusion

Practice in class

1. Thermal power plants generate electricity by burning coal. Which of the following statements about thermal power generation is correct ( )

A． Coal is a renewable energy source

B． Using the magnetic effect of electric current to generate electricity

C. Convert electrical energy into internal energy when generating electricity

D. Will cause environmental pollution

2. (Multiple choices) In order to control air pollution, the following measures are currently feasible ( )

A． Try to use natural gas instead of coal as the living fuel for urban residents

B． Develop and use new energy

C. Improve smoke and dust removal devices to improve their performance

D. Ban on the use of petroleum resources

3. In order to prevent environmental pollution and the intensification of the greenhouse effect, the following fuels are most ideal ( )

A． Coal b. hydrogen

C. Firewood D. oil

4. The nuclear reaction produced when deuteron and tritium nuclei are combined to form a new atomic nucleus is ( )

A. Decomposition reaction B. Chain reaction C. Fission D. Thermonuclear reaction

Keywords: Energy Materials and Society Teaching Courseware, Energy Development and Utilization Teaching Courseware, Shanghai Science Edition Ninth Grade Physics PPT Courseware Download, Ninth Grade Physics Slide Courseware Download, Energy Materials and Society PPT Courseware Download, Energy Development and Download PPT courseware in .PPT format;

For more information about the PPT courseware "Energy Materials and the Development and Utilization of Social Energy", please click the "Energy Materials and the Development and Utilization of Social Energy ppt" tab.

"Development and Utilization of Energy" Energy, Materials and Society PPT Courseware 2:

"Development and Utilization of Energy" Energy, Materials and Society PPT Courseware 2 Learning Objectives: 1. Be able to distinguish between renewable energy and non-renewable resources. 2. Understand the history of human development and utilization of energy. 3. Understand the current world and our country Current status of energy utilization and impact on the environment..

"Development and Utilization of Energy" Energy, Materials and Society PPT courseware:

"Development and Utilization of Energy" Energy, Materials and Society PPT courseware 1. Natural energy Renewable energy: Energy sources such as ________, ________, ________ and ________ that can ________ or can ________. Non-renewable energy: like ____..

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Update Time: 2024-07-26

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