"Energy and Sustainable Development" PPT Courseware 3

"Energy and Sustainable Development" PPT Courseware 3

Learning Content 1: Directionality of Energy Transfer and Energy Transformation

Self-study test

1. When a car brakes, due to friction, kinetic energy is converted into ____ energy. Although the total amount of energy does not change, since the converted internal energy cannot be recycled, the energy we can use is ____.

2. Whether it is the conversion of energy or the transfer of energy, they are all directional. People can only use energy in the process of ____ and ____ of energy. The use of energy is conditional and certain. cost.

collaborative inquiry

1. Observe the pictures and talk about what energy does the car consume when it wants to work? How is this energy transformed?

When a car is working, it consumes ________ of fuel. Fuel combustion converts chemical energy into ____ energy. Part of this internal energy is converted into the ____ energy of the car, and part of it is lost to the air through heat dissipation.

2. Discussion: Can we collect the converted mechanical energy or the internal energy lost into the air and reuse it?

3. Look at the picture on the right. When we boil water with a kettle, what energy do we consume, and what energy is this energy converted into? Can we reverse this process?

Consume chemical energy. Chemical energy is converted into water and the internal energy of the kettle. It is difficult for us to convert the internal energy of water and kettles into chemical energy again. To convert this internal energy into chemical energy, we need to consume other energy.

4. What do the above questions indicate?

Explain that the transformation or conversion of energy has a direction. Energy utilization comes at a cost. We need to save energy.

instant practice

1. The use of energy is nothing more than the conversion of one form of energy into another form of energy. Energy in nature is conserved. It can neither be created nor destroyed. That being the case, why should we save energy?

Although the total amount of energy in nature is conserved, we can only use energy in the process of energy conversion and transfer. The use of energy has costs and directions, so we must save energy.

Learning content 2: The impact of energy consumption on the environment

Self-study test

1. Extensive use of the following energy sources can cause increased air pollution ( )

A. Fossil energy b. solar energy

C. Wind energy D. nuclear energy

2. Fossil energy is widely used in modern life. The burning of fuel produces a large amount of carbon dioxide, exacerbating the ______ of the earth.

collaborative inquiry

1. Observing the pictures, what information did you get?

Cars produce a lot of exhaust gas, which pollutes the air.

2. Why do the carvings on these white marble pillars become blurry? What causes this?

3. The formation process of acid rain:

The combustion of coal, oil, and natural gas produces ____________ and ______, which combine with water in the air to form acid rain.

4. Dangers of acid rain:

Water and soil become acidified, plants and animals may die, and buildings may be corroded.

Self-study test

1. The use of energy must consider sustainable development. On the one hand, it is necessary to ________ to reduce the damage to the environment during energy use; on the other hand, it is also necessary to develop new ________.

2. Energy such as fossil energy and nuclear energy will be used less and less and cannot be replenished from nature in the short term. Such energy is called ______________.

3. Energy sources such as water energy, wind energy, and solar energy that can be continuously obtained in nature are called ____________________.

collaborative inquiry

1. In addition to the energy sources listed in books, what other energy sources do you know? They belong to renewable energy or non-renewable energy respectively.

Geothermal energy, tidal energy, etc., they are all renewable energy sources.

2. Taking a thermal power station as an example, talk about how to improve coal utilization.

Combining thermal power stations with heating centers, the waste heat from power generation can be used to heat water and heat cities.

3. Discussion: What is the ideal energy source in your mind for the future? What conditions does it need to meet?

Ideal energy must meet the following conditions:

1. Huge quantity and cheap enough; 2. Mature skills to ensure safety;

3. Clean and pollution-free, and cannot cause serious environmental problems.

Keywords: Energy and Sustainable Development Teaching Courseware, New People's Education Edition Ninth Grade Physics PPT Courseware, Ninth Grade Physics Slide Courseware Download, Energy and Sustainable Development PPT Courseware Download, .ppt format

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