Electricity is the form of energy energy

The landlord asked not very clearly, if you look at the classification of energy, it can be regarded as secondary energy.

The so-called primary energy refers to a variety of energy and resources directly taken from nature that have not been processed and converted, including: raw coal, natural gas, oil shale, nuclear energy, solar energy, hydropower, wind power, wave energy, tidal energy, geothermal, biomass energy and ocean temperature difference energy, etc.

Primary energy can be further divided into two categories: renewable energy and non-renewable energy. Renewable energy includes solar energy, hydropower, wind power, biomass energy, wave energy, tidal energy, ocean temperature difference energy, and so on. They can be recycled in nature.

Non-renewable energy sources include: coal, natural gas, oil shale, nuclear energy, etc., they are not renewable, use a little, a little.

The energy products obtained from the processing and conversion of primary energy are called secondary energy, such as: electricity, steam, gas, gasoline, diesel, heavy oil, liquefied petroleum gas, alcohol, biogas, hydrogen and coke, etc.

What is the temperature after mixing into 100 ml?

Measure 50 ml of hot water and measure the temperature?

Postscript: The relationship between heat and temperature may not be clear to students. "One container with warm water can get more heat than another" is even more difficult for many people to understand.

Topic: How is heat transmitted First Teaching Time Cumulative Teaching Time: 19

Teaching objectives: 1. Experience the activity process of designing experiments to verify your own speculation about heat transfer.

2. Able to obtain the understanding of different heat transfer modes of liquids, gases and solids.

3. Think deeply, be willing to cooperate with peers, and actively communicate your ideas with others.

Teaching focus: Gain an understanding of the different heat transfer modes of liquids, gases and solids.

Teaching difficulty: Gain an understanding of the different heat transfer modes of liquids, gases and solids.

Teaching utensils: red hot water, colorless cold water, stainless steel spoon, hot water, candle oil, alcohol lamp, iron stand.

Teaching process: 1. Introduction.

We know that when a cup of cold water is mixed with a cup of hot water, the temperature changes. What is the reason for this change?

1. Imagine how heat is transferred between cold and hot water.

2. Carefully observe the phenomenon of pouring cold water into red water along the wall of the cup.

3. Communicate the observed phenomena and talk about any new ideas.

4. How is heat transfer between cold and hot liquids? What else would you like to study?

2. Transfer of heat in gases.

1. How is heat transferred in the air?

2. Students make assumptions and explain why.

3. Light a candle and feel hotter in the hand.

4. How is heat transferred in gas?

3. Transfer of heat in solids.

1. What happens when you put the whole stainless steel spoon in hot water?

2. If only the spoon part of the stainless steel spoon is irrigated in hot water, and the handle of the spoon is exposed, will the handle of the spoon also heat up after a while?

3. The teacher demonstrates the experiment and asks the students to come on stage to talk about their feelings.

4. Change to a steel spoon with a longer handle than this spoon for experiments.

5. Can the heat be transferred? and exchange our ideas.

6. Is there a way for us to see or feel the transfer of heat in a solid?

7. The group discusses the plan, operates the experiment, and communicates the findings in the experiment.

4. Extracurricular outreach.

What other ways can heat be transferred?

How does the sun transfer heat to Earth?

Board book design: liquid - convection.

Gases – Radiation.

Solids – Heat conduction.

Teaching Reflection: In the previous lesson, students experienced the activity of mixing cold water and hot water, and have already perceived the phenomenon of geothermal transfer between hot and cold water. After doing the 3-song experiment above, students can learn more about good conductors and bad conductors of hot ground by reading the ground.

Electrical energy is the kinetic and potential energy of charged particles.

On the second floor, "Electricity is a property that produces repulsion and attraction between subatomic particles such as electrons and protons" seems to be wrong, but the repulsion and attraction between subatomic particles such as electrons and protons are "strong interaction forces".

Electricity is the directional movement of charged particles.

Electrical energy must have mass, because according to Einstein's mass-energy equation, e=mc*c, we can find the mass of electrical energy by removing the electric energy by the square of the speed of light.

Electricity is a type of energy and has no mass. Electricity is produced by the orderly movement of electrons in a conductor, so, it has no mass.

1. On the one hand, this question is a bit similar to the question of chicken or egg, which is difficult.

On the other hand, this question is bound to be traced back to the first motive force, the question of whether God exists.

2. Generally speaking, in our daily life, it is indeed converted from other forms of energy into electrical energy. Where do other forms of energy come from? 、、That's a little bit。

It's a question of chicken or egg.

What about other natural phenomena? Can you say that?

3. Where does the lightning and electricity in nature come from?

Many people will be charged from the clouds immediately.

And how do the clouds and mist get electrified? Clouds and mist rub together to generate electricity.

How did the clouds and mist form like filial piety? Absorbing solar energy, causing the water vapor to rise、、、 where does the earth's electromagnetic field energy come from?

Where does the energy for electrical, magnetic, and optical phenomena in space, especially on stars, come from?

From the universe of the great **! Why is it big**? 、、

To cope with the average elementary and middle school student, so to speak:

Electricity is converted from other energy sources, the most important of which are hydroelectric power stations and thermal power stations.

Electrical energy refers to the form of electronic energy, which is a form of energy widely used in modern industry, transportation, communication and daily life. The ** of electrical energy mainly comes from other forms of energy conversion, such as chemical energy, mechanical energy, light energy, etc. These forms of energy are converted into electricity, which is then transported to where it is needed.

The application range of electrical energy is very wide, from household electricity to industrial production, from aerospace technology to information technology, all of which are inseparable from the support of electric energy. With the continuous advancement of technology, the efficiency of electric energy utilization is also constantly improving, and people's demand for electric energy is also increasing. Therefore, the research and development of electric energy has become an important field of modern science and technology.

In practical applications, the conversion and transmission process of electrical energy is often affected by various factors, such as wire resistance, power loss, etc. In order to improve the conversion efficiency and transmission efficiency of electric energy, it is necessary to explore new technologies and methods. In recent years, the emergence and application of some new technologies, such as smart grid technology, energy storage technology, solar power generation technology, etc., have provided new ideas and ways for the utilization and development of electric energy.

In short, electric energy is an indispensable form of energy in modern society, and its use is of great significance to the development of modern economy and life. With the continuous progress of technology and the growing demand, the research and development of electric energy will receive more attention and investment, and make greater contributions to the progress and development of human society.

Electrical energy refers to the ability of the knower to do work (i.e., produce energy) in various forms.

Electric energy is widely used in power, lighting, metallurgy, chemistry, textiles, communications, broadcasting and other fields, and is the main driving force for the development of science and technology and the leap of the national economy.

Electrical energy includes direct current energy, alternating current energy, high-frequency electric energy, etc.

These types of electrical energy can be converted into each other.

The electrical energy used in daily life mainly comes from the conversion of other forms of energy, including hydro energy (hydroelectric power), thermal energy (thermal power generation), atomic energy (nuclear power), wind energy (wind power generation), chemical energy (batteries) and light energy (photovoltaic cells, solar cells, etc.).

Electrical energy can also be converted into other forms of energy that are required to bury disturbances, such as heat, light, kinetic energy, etc.

Electrical energy can be transmitted over long distances in the form of wired or wireless.

Answer]: AAnswer] A. Analysis:

Primary energy refers to various energies and resources that are directly taken from nature and have not been processed and converted, such as raw coal, natural gas, oil shale, nuclear energy, solar energy, hydropower, wind power, wave energy, tidal energy, geothermal, biomass energy and ocean temperature difference energy, etc., which can be further divided into. There are two main categories of renewable energy and dry non-renewable energy. Secondary energy refers to the energy obtained by the processing and conversion of primary energy, such as electricity, steam, gas, gasoline, diesel, heavy oil, liquefied petroleum belt gas, alcohol, biogas, hydrogen and coke, etc.

Therefore, the answer to this question is A.

Answer]: A The first step is to test the common sense of science and technology.

In the second step, electrical energy refers to the ability to use electricity to do work in various forms (i.e., to generate energy) to grind the hand, which is a secondary energy source. Secondary energy is a secondary energy that is processed and converted into another form of energy. There are mainly petroleum products such as electricity, coke, gas, biogas, steam, hot water and gasoline, kerosene, diesel oil, and heavy oil.

Answer]: auspicious d

The load is a liquid that takes electrical energy, which can convert the disturbance electrical energy into other forms of energy (such as light energy, heat energy, mechanical energy, etc.).

Trams are moving, so they are converted into mechanical energy; The iron and the electric light are heated, so the conversion bend is hidden into internal energy, and the bulb buries the hall and has light energy; Hair dryers are moving, which is converted into mechanical energy, and at the same time, they generate heat, which are converted into internal energy

Therefore, the sum answer: (1) mechanical energy, (2) internal energy, (3) internal energy and light energy, (4) mechanical energy and internal energy