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

Description

"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 produce energy for human use. (Such as coal, oil, natural gas, etc., they burn to produce energy, so they are energy sources.)

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 textbook 7, discuss with classmates, and answer 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?

2. Is there an energy crisis?

1. 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. 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. 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 75% 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.

Class exercises

1. Among the following examples, which are not energy sources ( )

A． Gasoline b. diesel engine

C. flowing water d. dry firewood

2. Which of the following energy sources are non-renewable energy sources ( )

A. Fossil energy B. Nuclear energy

C. Water energy D. Wind energy

E.Solar energy

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 Energy Conservation, Energy and Energy Crisis", please click the Energy and Energy Conservation Law ppt Energy and Energy Crisis ppt tag.

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

"Energy and Energy Crisis" Energy and the Law of Conservation of Energy PPT Courseware 2 People once cut down ignorantly, exploited greedily, consumed to their heart's content, and emitted emissions at will. The sun is sighing, the earth is groaning, and acid rain is raging, endangering the survival of all things. People have awakened to care for the earth. ..

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Update Time: 2024-11-22

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

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