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"Electricity and Energy" Energy PPT Courseware 3
Key points of knowledge in this lesson:
1. Working principle of electric motor: Use electricity to generate magnetism, and use the interaction of magnetism to rotate.
2. An electric motor is a machine that uses electricity to generate power.
3. The function of the commutator: to connect the current and convert the direction of the current.
4. The rotor in the motor is an electromagnet.
5. The distance between the magnet and the coil, the number of magnets, and the number of batteries will affect the speed of the rotor rotation.
Read pages 60-62 of the book and complete the thinking questions.
1. What is electrical energy?
2. Does sound have energy?
3. Does light have energy?
4. What energy does a moving object have?
5. What energy can be stored in fuel, food, and chemical substances?
6. All electrical appliances are electrical energy converters. What can electrical energy be converted into?
Four basic forms of energy:
Sound energy, light energy, electrical energy, thermal energy.
What other forms of energy are there?
The energy possessed by a moving object is called kinetic energy.
Fuel, food, chemicals store chemical energy.
Does any object require energy to work?
Any object requires energy to work. Without energy, there would be no movement and change in nature, and there would be no life.
Electrical energy can be converted into other forms of energy, and can other energies be converted into each other?
Burning firewood converts chemical energy into light energy and heat energy.
Setting off firecrackers is to convert chemical energy into kinetic energy, sound energy, light energy, etc.
A generator converts mechanical energy into electrical energy.
Key points of knowledge in this lesson:
1. Energy comes in many forms such as sound energy, light energy, electrical energy, thermal energy, etc.
2. Chemical energy is stored in food, fuel, and some chemical substances.
3. Electrical energy can be converted into other forms of energy, and other different forms of energy can also be converted into each other.
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