"Solar Energy" Energy and Sustainable Development PPT Courseware 2

Description

"Solar Energy" Energy and Sustainable Development PPT Courseware 2

teaching objectives

1. Understand the origin and characteristics of solar energy.

2. Know two ways to directly utilize solar energy.

【Discussion·Exchange】

Imagine what our world would look like without the sun?

1. The sun - a huge nuclear furnace

The sun is 150 million kilometers away from the earth, its diameter is about 110 times that of the earth, its volume is 1.3 million times that of the earth, its mass is 330,000 times that of the earth, and its core temperature is as high as 15 million degrees Celsius.

1. The origin of solar energy:

Inside the sun, hydrogen nuclei fuse at ultra-high temperatures, releasing huge amounts of nuclear energy. Hydrogen bomb explosions are happening every moment in the core of the sun, and the sun is like a huge "nuclear furnace."

2. Transmission of solar energy:

Most of the solar energy is radiated in the form of heat and light.

The surface temperature of the sun is about 6000°C. The sun has been "burning" stably for nearly 5 billion years and can continue to "burn" for another 5 billion years.

2. The sun is a treasure house of human energy

Only about one billionth of the energy radiated outward by the sun is transmitted to the earth.

Sunlight has been shining on our earth for nearly 5 billion years. The solar energy accumulated by the earth during these nearly 5 billion years is the source of most of the energy we use today. Human beings cannot live without sunlight in their daily lives.

The formation of fossil energy

Plants in ancient times converted solar energy into chemical energy in living organisms through photosynthesis.

After the continuous movement of the earth's crust, the bodies of animals and plants after death are buried underground and under the sea.

After millions of years of complex changes, it became coal, oil, and natural gas.

When we mine fossil fuels today, we are actually mining the solar energy that the earth received hundreds of millions of years ago.

3. Utilization of solar energy

There are two main ways to directly utilize solar energy.

1. photothermal conversion

Use collectors to collect energy from sunlight to heat water and other substances. Realized the conversion of solar energy into internal energy.

2. Photoelectric conversion

Solar cells convert solar energy into electricity;

It is widely used in aviation, aerospace, transportation, communications and other fields.

Exchange and discussion

What are the advantages of solar energy:

It is clean energy and does not pollute the environment.

Inexhaustible and inexhaustible, it is the cheapest energy

According to expert estimates, the solar energy radiated to the earth's surface is equivalent to 80,000 times the world's current total electricity generation. Two-thirds of our country's land area has more than 2,200 hours of sunshine per year. If all this solar energy is used for power generation, it will be approximately equal to the total power generation of tens of thousands of Three Gorges Projects.

Disadvantages of solar energy:

There are dispersion, instability, low conversion efficiency and high cost.

do you know

Solar energy is the most basic energy source on earth

Whether it is biomass energy, wind energy, or hydraulic, temperature difference and tidal energy, they are all forms of conversion of solar energy. The energy contained in fossil fuels also comes from the solar energy absorbed and utilized by living organisms in ancient times.

Utilization of solar energy: light energy-chemical energy

In daytime sunlight:

Na2SO4·10H2O=Na2SO4+10H2O

Temperature drops at night:

Na2SO4+10H2O = Na2SO4·10H2O

Classroom exercises

1. Solar energy can be used directly. Among the following devices, the one that converts solar energy into internal energy is (). What converts solar energy into electrical energy is ( ).

A. Silicon photovoltaic cell B. Solar cooker C. Solar collector D. Solar thermal power station

2. The conventional energy used by humans today is ( ), and the new energy is ( ).

A. Fossil energy B. Solar energy C. Nuclear energy D. Electric energy

3. The most eye-catching among new energy sources is _________ energy. Its main advantages are ________, ________, ________ and no pollution to the environment.

4. Although solar energy is the most ideal new energy source, there are still some technical difficulties in its large-scale utilization. What should we do now?

Keywords: Energy and Sustainable Development Teaching Courseware, Solar Energy 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, Solar Energy PPT Courseware Download, .ppt format

For more information about the "Energy and Sustainable Development of Solar Energy" PPT courseware, please click the Energy and Sustainable Development ppt Solar Energy ppt tag.

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Update Time: 2024-07-30

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

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