"Electricity and Energy" Energy PPT Courseware 4

"Electricity and Energy" Energy PPT Courseware 4

With electrical appliances, you can perform various "works" - do various exercises or emit light, sound, heat...

We call this energy possessed by electricity electrical energy.

There are other forms of energy, such as heat energy, light energy, sound energy... What "work" can these energies do?

Any object requires energy to work. Without energy, there would be no movement and change in nature, and there would be no life.

Energy comes in different forms such as electrical energy, thermal energy, light energy, sound energy, etc.

Moving objects also have energy called kinetic energy.

Energy is also stored in fuel, food and some chemicals, called chemical energy.

Energy neither creates nor disappears out of thin air. It can only be converted from one form to other forms, or transferred from one object to another. During the process of transformation or transfer, the total amount of energy remains unchanged. This is the law of conservation of energy.

For example, all electrical appliances are electrical energy converters that can convert input electrical energy into other forms of energy.

People use electricity to conveniently obtain power, light, heat, sound and magnetism... Through the wonderful conversion between electrical energy and other energies, our production and life have become more and more convenient.

Investigations have shown that electrical energy can be converted into other forms of energy. So, can other energies also be converted into each other?

How do we feel when we rub our hands against each other? How is energy converted?

Your hands will feel hot. Kinetic energy (mechanical energy) is converted into thermal energy.

Bending a section of wire repeatedly and touching the wire, how do you feel?

The wire will heat up. Kinetic energy (mechanical energy) is converted into thermal energy.

A burning candle, what can be transformed into what can it be?

Chemical energy is converted into light energy and heat energy.

Setting off firecrackers and fireworks, what can be transformed into what can it be?

Chemical energy is converted into mechanical energy, sound energy and light energy.

What can plants convert into during photosynthesis under sunlight?

Solar energy is converted into chemical energy.

Energy is a very commonly used and very basic physical concept. It is also a very abstract and very difficult to define physical concept. In the future, your high school teachers and university teachers will continue to guide you in your study.

As primary school students, we only need to briefly understand:

1. Energy comes in many forms such as electricity, heat, sound, light, etc. Energy is also stored in food and fuel and is called chemical energy.

2. Electrical energy can be converted into other forms of energy. Other different forms of energy can also be converted.

3. Common energy types include: electrical energy, thermal energy, sound energy, light energy, wind energy, kinetic energy, tidal energy, solar energy, chemical energy, magnetic energy, etc.

1. We live in a world of energy every day and everything we do is related to energy. ( )

2. Some objects do not require energy to work. ( )

3. Energy can be converted. The crane converts electrical energy into mechanical energy ( )

4. The energy possessed by objects related to motion is called mechanical energy. ( )

1. Laser can punch holes or cut materials, explain laser ( ).

A. With energy B. Very hard C. Sharp

2. Which of the following objects has mechanical energy ( ).

A. Food B. Electricity C. Running water

3. When using a flashlight, electrical energy is converted into ( ).

A. Chemical energy B. Kinetic energy C. Light energy

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For more information about the "Energy Electricity and Energy" PPT courseware, please click on the Energy ppt Electricity and Energy ppt tab.

"Electricity and Energy" Energy PPT download:

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