"Energy and Energy Crisis" Energy and Energy Conservation Law PPT Courseware 2

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"Energy and Energy Crisis" Energy and Energy Conservation Law PPT Courseware 2

People once ignorantly cut down

Exploit greedily, consume as much as you want, and discharge at will

The sun is sighing, the earth is groaning, and acid rain is raging

Endangering the survival of all things

people woke up

It is urgent to care for the earth and purify the environment

teaching objectives

1. Understand the general process of the history of human utilization of energy, and know the relationship between energy, human survival and social development

2. Understand the world's energy consumption structure and some of our country's energy consumption structures as well as energy storage conditions

3. Be able to describe the characteristics of non-renewable energy and renewable energy with examples.

think:

Observe pictures of excavators, trains, motorcycles, cars, rockets, solar cars, and gliders. Think about what substances provide the energy for their operation.

energy concept

Material resources that can provide energy, such as coal, natural gas, oil, water flow, wind, electricity, sunlight, etc., we call them energy.

1. The history of human use of energy

Read pages 70-71 of the textbook, discuss with classmates, and answer the questions.

1. On what principles do people divide the history of human energy use into four periods? What are the names of these four periods?

People divide energy periods based on the principle of which energy sources are mainly used by humans in a certain period. It is usually divided into "firewood period", "coal period", "oil period" and "diversification period".

2. What have you learned from the history of human energy use?

Energy is indeed the lifeblood of human existence and the driving force for social development, but at the same time, we wonder whether these energy sources, such as coal, oil and natural gas, are inexhaustible? What if they run out?

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 electricity, gasoline, alcohol

2. Structure of world energy consumption

More than 90% of world energy consumption is now non-renewable energy

Use more oil than coal and more coal than natural gas

3. my country’s current energy consumption structure is very unreasonable

Coal accounts for 68% of energy use, far more than oil and natural gas, and the proportion of non-renewable energy used is too large.

Hydropower and coal resources are abundant, but oil resources are in short supply.

The extensive use of coal has caused serious environmental pollution.

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?

There may be an energy crisis. Our middle school students should do the following:

1. Start by saving energy.

2. Work hard to learn scientific and cultural knowledge now, develop science and technology in the future, improve energy utilization, and develop new energy.

Practice in class

1. Multiple choice questions

1. Which of the following energy sources is secondary energy ( )

A. Oil B. Nuclear energy C. Natural gas D. Electric energy

2. Which of the following energy sources is renewable energy ( )

A.Wind energy B.Oil C.Natural gas D.Coal

3． Travel is an indispensable part of people's work and life. There are various tools for traveling and the energy used is also different. The types of energy consumed by bicycles, electric bicycles and fuel vehicles are ( )

① Bioenergy ② Nuclear energy ③ Electric energy ④ Solar energy ⑤ Chemical energy

A. ①③⑤B. ①④⑤C. ①②③Ｄ. ①③④

4. The energy we use can be divided into ________ energy and ________ energy according to whether it can be obtained directly from nature; according to whether it can be replenished from nature in the short term, it can be divided into ________ energy and ________ energy.

5. my country will implement the Renewable Energy Law on January 1, 2006. This law not only shows people the great significance of renewable energy to future social life, but also points out a clearer direction for the future development of renewable energy.

(1) Currently, the commonly used energy sources in our country include coal, oil, natural gas, wind energy, hydro energy, nuclear fuel, solar energy, etc. Among them, the renewable energy sources are __________________.

(2) Compared with non-renewable energy, the main advantages of renewable energy are: (Only one item is required)____________________________.

Summary of this lesson

1. The history of human use of energy

“Firewood Period”, “Coal Period”, “Oil Period” and “Diversification Period”

2. Is there an energy crisis?

1. Classification of energy: renewable energy and non-renewable energy

2. Structure of world energy consumption

3. my country’s current energy consumption structure

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For more information about the PPT courseware "Energy and the Law of Conservation of Energy Energy and Energy Crisis", please click the PPT tag of Energy and the Law of Conservation of Energy PPT Energy and Energy Crisis.

"Energy and Energy Crisis" Energy and Energy Conservation Law PPT courseware:

"Energy and Energy Crisis" Energy and Energy Conservation Law PPT courseware 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 generate energy for human use. (Such as coal...

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Update Time: 2024-06-30

This template belongs to Physics courseware Guangdong and Shanghai Edition Ninth Grade Physics Volume 2 industry PPT template

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