"Water Energy and Wind Energy" mechanical energy and its transformation PPT courseware

Description

"Water Energy and Wind Energy" mechanical energy and its transformation PPT courseware

learning target

(1) Know the utilization and value of water energy;

(2) Understand the utilization and value of wind energy.

1. Water energy

The development of water energy utilization over time

As early as 1900 years ago, our ancestors made wooden water wheels, which were not very powerful.

In the 18th century, high-power water turbines were manufactured for use in textile and metallurgical factories. Factories at this time had to be built next to rivers.

In the 19th century, water turbines drove generators to generate electricity, and the problem of factory location restrictions was solved.

Large water turbines and dams were built to increase energy.

Working Mechanism

The shaft of the axial flow turbine is mounted vertically on the bearing, and there are 3-6 impellers at the lower end of the shaft. When water flows along the direction of the shaft and impacts the impeller, the energy of the water is transferred to the turbine, driving the generator to generate electricity.

2. Wind energy

Wind energy in nature is a natural resource with a large amount of mechanical energy.

science technology society

Develop water resources scientifically and rationally

There are more than 1,500 larger rivers in my country, with water energy reserves reaching 6.8×108kW, of which 3.8×108kW can be developed and utilized, ranking first in the world. Since the founding of New China, we have built many hydropower stations on the Yellow River, with a total power generation of 3.56×106kW. By the end of 2010, the annual power generation capacity of hydropower stations in my country had reached 3.5×1012kW·h. In July 2010, the Three Gorges Hydropower Station units achieved the 1.82×107kW, 168-hour operation test target, and the daily power generation exceeded 4.3×108kW·h, accounting for 5% of the country’s daily power generation.

While water conservancy and hydropower projects play a role in flood control, irrigation, water supply, and power generation, they will inevitably change the regional environment and may have adverse effects on the natural ecological environment. Therefore, water resources must be developed scientifically and rationally, and cannot be developed blindly and disorderly.

Summary of this lesson

What did you gain from studying this class?

1. Water energy

Running water in nature is a natural resource with a large amount of mechanical energy.

Utilization of water energy: grinding flour, pumping water, hydroelectric power generation, etc.

2. Wind energy

Wind in nature is a natural resource with a large amount of mechanical energy.

Utilization of wind energy: sailing boats, windmills turning to generate electricity, etc.

Practice in class

1. The flowing river water has _______ energy. Barrages are built upstream of a river to increase _______, thereby increasing the _______ energy of water. When water flows down from an upstream dam, the _______ energy of the water is converted into _______ energy.

2. The tide of seawater also has huge energy. When the seawater rises, _______ energy is converted into _______ energy; when the seawater recedes, _______ energy is converted into _______ energy.

3. Wind is a flowing _______ and has _______ energy.

4. Water falls from a height. Which of the following statements is correct ( )

A. The kinetic energy of water gradually increases and the mechanical energy increases

B. The kinetic energy of water remains unchanged and the gravitational potential energy gradually decreases.

C. The kinetic energy of water gradually increases, while the gravitational potential energy remains unchanged.

D. The process of converting the gravitational potential energy of water into kinetic energy

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For more information about the PPT courseware "Mechanical Energy and Its Transformation into Water Energy and Wind Energy", please click on the Mechanical Energy and Its Transformation ppt Water Energy and Wind Energy ppt tag.

"Water Energy and Wind Energy" Mechanical Energy and its Transformation PPT Courseware 2:

"Water Energy and Wind Energy" Mechanical Energy and its Transformation PPT Courseware 2 1. River flow energy 1. Water energy mainly refers to river flow energy and is the third largest energy source in my country. 2. River water flow energy comes from solar radiation and is a renewable energy source. 3. The principle of formation: Due to the radiation of the sun..

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Update Time: 2024-11-19

This template belongs to Physics courseware Lu Jiao Edition Eighth Grade Physics Volume 2 industry PPT template

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