"Energy, Crisis and Hope" PPT Courseware on Particles and the Universe

Description

"Energy, Crisis and Hope" PPT Courseware on Particles and the Universe

teaching objectives

1. Understand through examples that energy can be transferred from one object to another and that different forms of energy can be converted into each other.

2. Have a preliminary understanding of the history of human discovery, development, and utilization of energy, and be able to describe the relationship between energy, human survival, and social development through specific examples.

1. Energy transformation and conservation law

Materials in nature have different forms of motion

Observe and think

What energy is present in various forms of movement? What are the different forms of energy that are converting into each other when making sounds? What are the rules for the mutual transformation between different forms of energy connection?

Energy transformation and conservation law

Energy will not disappear out of thin air, nor will it be created out of thin air. It will only be converted from one form to other forms, or transferred from one object to other objects. During the process of transformation and transfer, the total amount of energy remains unchanged. This is the law of energy transformation and conservation.

2. Energy and Energy

Energy is associated with matter and its motion. Corresponding to different forms of motion, there are different forms of energy. There are natural resources in nature that can provide energy for humans, called energy. Energy is the material basis of human social activities.

Think about it: We need to eat and drink water every day. What do we use to cook food and boil water?

Answer: Coal, gas, firewood, natural gas, electricity... these are all energy sources.

importance of energy

In 2003, a sudden widespread power outage occurred in the eastern United States and Canada at 4:14 pm local time on August 14, affecting the eastern Canadian city of Toronto and even the New York area in the eastern United States.

Traffic paralysis caused by power outage

Human life and production are inseparable from the utilization of energy. What is the current state of energy?

Is China really rich in energy resources?

1. Coal resources: geological reserves are approximately 1.44 trillion tons, accounting for 13% of the world’s total coal reserves;

2. Oil resources: The remaining reserves are 60 billion tons, but reserve resources are insufficient, and the growth rate of recoverable oil reserves is lower than the decline rate of old oil fields, and the reserve-production ratio is on a downward trend;

3. Natural gas resources: retained reserves are 700 billion cubic meters, but reserve resources are insufficient; hydraulic resources: theoretical reserves are 680 million kilowatts, but developable reserves are only 378 million kilowatts, and 67.8% of the hydraulic resources are concentrated in the southwest. It is not easy to develop. There is no doubt that our country is one of the energy-rich countries in the world, but our country has a large population and its per capita energy share is far lower than that of Russia and the United States, only 1/2 of the world's per capita energy share.

3. Matter and energy

Humanity's demand for energy is increasing day by day, and non-renewable energy sources such as coal, oil, and natural gas are decreasing day by day. The most urgent need of mankind in the 21st century is to change the current situation of serious energy shortage. The development of new energy sources is urgent.

In 1905, Einstein revealed the relationship between matter and energy E, symbolized by mass M, with the surprisingly simple formula E=MC2. In the formula, C is the speed of light in vacuum.

Einstein's mass-energy equation provides theoretical support for the development and utilization of nuclear energy.

The energy released when 1KG of uranium is completely fissioned is equivalent to the energy released by the complete combustion of 2500T of high-quality coal.

4. Science and Humanity

Physics research shows that some energy sources, such as solar energy, wind energy, tidal energy, hydropower and geothermal energy, can be considered unlimited, so they are also called renewable energy sources.

The continuous development of contemporary science and technology has enabled humans to understand and utilize the natural environment, promoted the progress of human society, and improved the quality of human life. However, with the application of new technologies, it has also caused a series of problems such as environmental pollution, energy shortage, global warming, ozone depletion, and species extinction.

Therefore, we should establish a scientific outlook on development, and while using science and technology to improve lives, we should also pay attention to avoiding social problems caused by the abuse of technology, and promote the comprehensive, coordinated and sustainable development of human society.

Class exercises

1. The main measures to solve energy problems are ( )

A. Vigorously develop new energy sources

B. Make extensive use of solar energy and geothermal energy

C. Make extensive use of water energy and wind energy

D. Adopt new technologies and new equipment, and update backward technical equipment

2. Which of the following statements about nuclear energy is correct ( )

A. Matter is composed of atoms, and there are nuclei in atoms, so nuclear energy can be obtained by using any substance

B. So far, humans have two ways to obtain nuclear energy, namely heavy nuclear fission and light nuclear fusion.

C. Atomic bombs and hydrogen bombs are both made using the principles of nuclear fission and fusion.

D. Fission occurs in nature only under artificial conditions

Summary of this lesson

Energy: Crisis and Hope

1. The relationship between humans and energy.

2. Human use of energy.

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For more information about the PPT courseware "Particles and the Universe Energy Crisis and Hope", please click the Particles and the Universe ppt Energy Crisis and Hope ppt tag.

"Energy Crisis and Hope" Particles and Universe PPT Courseware 4:

"Energy Crisis and Hope" Particles and Universe PPT Courseware 4 What forms of energy have we learned? Mechanical energy, light energy, internal energy, chemical energy, electrical energy. Question: Do students know what can be called energy in life? What is energy? Summary: Anything that can provide...

"Energy Crisis and Hope" Particles and Universe PPT Courseware 3:

"Energy Crisis and Hope" Particles and the Universe PPT Courseware 3 Discussion: What is the original use of energy by humans now and in the future? Science and Humanity 1. Solar heat storage (solar thermal energy) 2. Direct solar power generation: solar cells (solar electrical energy) 1. ..

"Energy Crisis and Hope" Particles and Universe PPT Courseware 2:

"Energy Crisis and Hope" Particles and Universe PPT Courseware 2 The power generation principle of the Three Gorges Hydropower Station The generator rotates under the drive of the water turbine to generate electricity. The upstream water level increases and the potential energy of the water increases. The high water level water flows rapidly downward and pushes the water turbine to rotate. Electric energy is only in human life and life. .

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Update Time: 2024-07-30

This template belongs to Physics courseware Beijing Normal University Ninth Grade Physics Volume 2 industry PPT template

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