"Light and Heat" Light PPT download

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"Light and Heat" Light PPT download

Part 1: Importing new lessons

Red and big,

It gets wild when it sees the wind,

He who has no mouth can eat everything in the world,

Only afraid of rain, not wind.

Fire can both emit light and heat, so what is the relationship between light and heat?

Light and Heat PPT, Part 2: Exploration Experiment

What is a light source? Classification of light sources?

The relationship between the intensity of light and temperature

How to form strong light and obtain high temperature

Light source classification

Thermal light source: emits light and heats, such as incandescent lamp, lit candle, alcohol lamp, etc.

Cold light source: emits light without generating heat, such as fireflies, mercury lamps, fluorescent lamps, etc.

Many light sources also generate heat when they emit light. While the sun brings us light, it also brings us warmth. It is the largest source of light and heat on Earth.

Light and heat PPT, part three: expansion and extension

A solar cooker is a device that uses solar radiation to collect heat through a concave mirror to cook food. It does not burn any fuel and does not cause any pollution. When used normally, it is faster than a briquette stove and the same speed as a gas stove.

Solar street lights use sunlight as energy. They can be charged during the day and used at night. There is no need for complicated and expensive pipeline laying. The layout of the lamps can be adjusted arbitrarily. They are safe, energy-saving and pollution-free. They do not require manual operation. They work stably and reliably, saving money and free of maintenance.

Light and Heat PPT, Part 4: Class Summary

Many light sources also generate heat while emitting light. The sun is the largest light source and heat source on the earth.

The temperature is high when the light is strong, and the temperature is low when the light is weak.

Convex lenses and concave mirrors have many applications in life.

Light and heat PPT, Part 5: Test in class

1. Fill in the blanks

1. The sun is the largest on earth ( ).

2. ( ) Use convex lens to produce oxygen.

3. ( ) is a type of spherical mirror, also called ( ).

4. Light sources can be divided into ( ) and ( ).

2. Judgment

1. The temperature is high when the light is strong, and the temperature is low when the light is weak. ( )

2. Many light sources also generate heat while emitting light. ( )

3. Solar cookers are made using the principle of convex lenses. ( )

4. The light-emitting principles of cold light sources and hot light sources are the same. ( )

Light and Heat PPT, Part 6: Homework

Make a simple solar cooker.

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For more information about the "Light, Light and Heat" PPT courseware, please click on the "Light ppt" light and heat ppt tab.

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Update Time: 2024-11-25

This template belongs to science courseware Fifth Grade Science Volume 1, Textbook Edition industry PPT template

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