![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
Before the discovery of electromagnetic induction (electricity generated by magnetic energy), how do people use electricity and what kind of electricity is used to discover electricity generating magnetism?
Before electromagnetic induction, human beings had no electricity. Only a few scientists used chemical batteries to do some experiments
Electromagnetism is produced by the chemical battery, through the current, degaussing needle rotation, found the electric energy to generate magnetism
The birds in the sky have
1 kinetic energy
2 potential energy
Kinetic energy and potential energy
I'll explain it in a popular way
Kinetic energy means that when something is moving, it has kinetic energy
Potential energy means height. Height means potential energy
Although this is not standard enough, can not be used for written expression, but it is very convenient to do multiple-choice questions
Birds can be seen in the sky, what can be seen on the ground?
Birds can be seen in the sky and grass can be seen on the ground
There are many birds in the air
There are many flying birds in the air.
RELATED INFORMATIONS
- 1. What did the birds in the air inspire us to invent? Who invented it? When was it invented?
- 2. Mechanical energy, electric energy, internal energy, light energy and chemical energy
- 3. Kneel for the electric cooker cooking, water and rice, electric cooker power, cooking time function. Thank you
- 4. Examples of mutual transformation of internal energy and chemical energy Conversion of internal energy into chemical energy
- 5. What is the specific process of wind power generation?
- 6. What is the energy conversion in the process of wind power generation
- 7. Try to analyze the energy conversion between wind power for home lighting, if there is no energy loss, what will happen
- 8. How can inductors convert the stored magnetic energy into electrical energy and send it back to the power supply? The pure inductor does not consume energy. In the first and the third quarter cycle, P is positive, and the capacitor takes electric energy from the power supply and converts it into magnetic energy, which is stored in its magnetic field; in the second and the fourth quarter cycle, P is negative, Inductive elements convert the stored magnetic field energy into electric energy and send it back to the power supply. How can inductive elements convert the stored magnetic field energy into electric energy and send it back to the power supply? Also, if the pure inductance does not consume energy, where does the electromagnetic torque come from? Because the stator winding of the motor is also pure inductance, Electric energy is converted into magnetic energy, and then magnetic energy is converted into electric energy. How can there be electromagnetic torque output?
- 9. What can be converted into what can be converted into what can be converted into when the battery is used for external power supply? What can be converted into what can be converted into when the generator is used for power generation?
- 10. After the invention, people will be able to convert other forms of energy into electricity on a large scale
- 11. Electromagnet converts electric energy into () energy? 1, kinetic energy? 2, mechanical energy? 3 and magnetic energy
- 12. Does the iron absorption of magnet violate the law of conservation of energy? A piece of iron moves under the attraction of a magnet. Is the energy of the magnet converted into the kinetic energy of the iron? If so, why does the "magnetic force" of the magnet not gradually decrease?
- 13. Does ampere force do work? Why
- 14. Second year physics ampere force to do work to convert the basic problem of energy! Very urgent! A small stick is connected to a closed loop placed on the table, and the friction force is ignored. There is B perpendicular to the table inward. When the stick moves to the right, we can know that in the horizontal direction, the stick is only subjected to the ampere force to the left, and the ampere force does negative work, So what energy does the kinetic energy of the rod convert into? Is it the heating energy of the resistor in the closed loop? Is the power of the ampere force equal to the power consumed in the closed loop? Why? The most important thing is why the power of Ampere force is equal to the power consumed in the closed circuit? Ampere force is the effect of magnetic field on the current. What is the relationship between ampere force and the power consumed in the closed circuit?
- 15. Is sound energy mechanical
- 16. Physics -- an example of using sound energy People use sound energy to do things. Who knows some examples of this,
- 17. Why does friction heat up
- 18. Friction between hands produces heat
- 19. Transformation of mechanical energy into heat energy in daily life I'll use it in class in an hour
- 20. Examples of conversion of mechanical energy into thermal energy