Why convert and control electrical energy

The reason is that electricity cannot be used directly by people. So to convert it.

For example, the electrical energy is converted into heat energy through loads such as resistance or inductor, which is used for heating, cooking, and of course, it can also be converted into other forms of energy such as light energy and kinetic energy through other equipment to meet people's production and living needs.

For the control of electric energy, we have to control it according to the needs of the load (voltage regulation, frequency regulation, etc.), in addition, electric energy is an energy that is easy to be transmitted, which plays an indispensable role in people's lives, but at the same time it also has a certain degree of danger, improper use will cause accidents, cause fires, electric shocks and other accidents, which is also the reason why it needs to be controlled.

Electricity produced by various power plants:

It must be converted into the national general standard electric energy before it can be integrated into the national grid and transmitted to users. For example, China's power frequency voltage: three-phase sinusoidal AC, electric frequency 50 cycles, phase difference.

120 degrees. Different levels of voltage above 400V. It is often referred to as three-phase alternating current.

Net. Any power plant must adjust its own electric energy products to the power frequency power range before they can be delivered to the user's home. Conversion and control go hand in hand, and the control is automated.

Conversion and control in power plants:

Generally, the power plant adjusts the frequency by adjusting the generator speed, and adjusts the output voltage by adjusting the excitation voltage, and the phase difference is fixed without adjustment. Some special power plants have different tuning methods, such as solar panels.

The output is DC and must be dedicated to the battery to charge and then pass through the inverter.

Convert DC into 400V AC power and send it to the grid; Wind generator.

It's much the same as this, it's also charged first. The adjustment of nuclear power is not familiar, but the final one must also comply with the national standard to enter the grid.

There is also a special case: the HVDC transmission method, which has not passed. caused a revolution in all equipment. I guess it's an experiment.

in the State Grid.

Transitions and Controls in :

The main purpose is to increase the voltage and decrease the voltage conversion.

Power conversion and control in the user:

There are voltage conversion, frequency conversion, AC and DC conversion according to the requirements of use, which can be seen everywhere.

There are electric, electrical, electrical, electro-optical, electromagnetic, and electroacoustic conversion according to the use function. It's everywhere. Anyone can understand it.

The conversion of electrical energy into kinetic energy is the use of electromagnetic induction. A rotating electric field produces a magnetic field, and a rotating magnetic field produces an electric field. The generator cuts the magnetic inductance line through the coil to generate an electric current; The electric motor uses the electric field generated by the energized coil to force the rotor and rotate constantly, which is related to the magnetic field generated by the current.

The motor converts electrical energy into mechanical energy. It uses an energized coil (i.e., stator winding) to generate a rotating magnetic field that acts on the rotor (such as a squirrel cage enclosed aluminum frame) to form a magnetoelectric rotational moment. The working principle of the motor is that a magnetic field acts on an electric current to make the motor turn.

Data expansion: Precautions: (1) Before disassembly, blow off the dust on the surface of the motor with compressed air and wipe off the dirt on the surface.

Select the working place where the motor disintegrates and clean up the site environment. Familiar with the structural characteristics and maintenance technical requirements of the motor. (4) Prepare the tools (including special tools) and equipment required for disassembly.

In order to further understand the defects in the operation of the motor, if possible, inspection tests can be carried out before disassembly. Therefore, put the motor into load test operation, check the temperature, sound and vibration of each part of the motor in detail, and test the voltage, current and speed, and then disconnect the load, do a no-load inspection test separately, measure the no-load current and no-load loss, and make a record. [6] Cut off the power supply, remove the external wiring of the motor, and make a record.

Select a megohmmeter with the appropriate voltage to test the insulation resistance of the motor. In order to compare with the insulation resistance measured in the last overhaul to judge the change trend and insulation state of the motor, the insulation resistance measured at different temperatures should be converted to the same temperature, and the barrier is generally 75. Test the absorption ratio k, when the absorption ratio is greater than that, it means that the insulation of the motor is not affected by moisture or the degree of moisture is not serious.

For comparison with the previous data, the absorption ratio measured at any temperature is also converted to the same temperature.

OK. In 1821, the German Seebeck discovered that if there is a temperature difference between the two joints in a circuit composed of two different metals (antimony and copper), a magnetic field will appear around them, and further experiments found that there is an electromotive force in the circuit. The discovery of this effect laid the foundation for the production of thermocouples, thermoelectric differential power generation and thermoelectric sensors.

Thermoelectric conversion materials directly convert heat energy into electrical energy, which is an all-solid-state energy conversion method without chemical reaction or fluid medium, so it has the advantages of no noise, no wear, no medium leakage, small size, light weight, easy to move, long service life and other advantages in the process of power generation, and has an "irreplaceable" status in special applications such as military batteries, long-range space detectors, long-distance communication and navigation, and microelectronics.

When one end of two different types of thermoelectric conversion materials N and P are combined and placed at high temperature, and the other end is open and given low temperature, due to the strong thermal excitation effect at the high temperature end, the hole and electron concentration are also higher than those at the low temperature end, driven by this carrier concentration gradient, the holes and electrons diffuse to the low temperature end, thus forming a potential difference at the low temperature open end. If many pairs of p-type and n-type thermoelectric conversion materials are connected together to form a module, a high enough voltage can be obtained to form a thermoelectric generator.

Internal energy: The sum of kinetic energy and potential energy of the irregular motion of the molecules that make up the object is called internal energy.

Electrical energy: There is a potential difference, and the energy can be released by adding a suitable medium between the potential differences.

It can not be directly converted into electrical energy.

The most common form of generating electrical energy is through a generator, and the most basic principle of a generator is that the wire cuts the magnetic field lines to generate a dynamic electromotive force. Pushing the wire to continuously cut the magnetic field line requires continuous external force**, and the external force** is generally provided by the steam pushing mechanical device (have you ever heard of the steam train, that is, the steam generated by continuous boiling drives the mechanical device, and then popularly, your house boils water, and the lid is not lifted when the water is boiled. ）

How to produce continuously boiling water: very simple, continuous heating, one is a thermal power station, which is heated by burning coal, and the other is a nuclear power plant, which is heated by burning nuclear fuel, which here includes U235, U238, PU239 (the number should be superscripted). Burning nuclear fuel is not an ordinary combustion with a chemical reaction with oxygen, but a fission reaction (more complicated, you will understand later).

Another type of sustained force** is the direct thrust of water, i.e. a hydroelectric power station, which uses the gravitational potential energy of water to create high pressure at the bottom of the dam, which in turn uses the water pressure to push the generator to turn (similar to how you would be knocked down by a high-pressure water gun).

No, I think different energies can't be directly converted, there must be a medium or instrument, there is still energy loss when energy is converted, and if the internal energy is to be converted into electrical energy, it can be converted through a generator, but there will be energy loss in the conversion process, not 100% conversion.

No, internal energy has to be converted into mechanical energy or other forms of energy before it can be converted from mechanical energy to electrical energy.

In terms of junior high school knowledge, it should not be, but in fact it is possible, for example, when the temperature of the two ends of a wire is different, it will generate a voltage between the two ends, which is the so-called thermocouple.

With junior high school knowledge can't, but it shouldn't be nothing.

Because of the law of conservation of energy, the electric field force does positive work, and the positive charge decreases from high potential to low potential, and the corresponding negative charge decreases from low potential to high potential, and the electric potential energy also decreases, so the electric potential energy is reduced.

Energy is neither created nor disappeared out of thin air, it simply transforms from one form to another, or from one object to another, while the total amount of energy remains the same. The law of conservation of energy is one of the universal fundamental laws of nature.

1. Hydroelectric power.

The basic principle of hydropower generation is to use the water level difference to cooperate with the hydrogenerator to generate electricity, that is, to use the potential energy of water to convert the mechanical energy of the water wheel.

The generator is then driven by mechanical energy to obtain electricity. Scientists.

With the natural conditions of this water level difference, the effective use of fluid engineering and mechanical physics is carefully matched to achieve the highest power generation, so that people can use cheap and pollution-free electricity.

2. Thermal power generation.

The thermal power generation system is mainly composed of combustion system (with boiler as the core), steam and water system (mainly composed of various pumps, feed water heaters, condensers, pipelines, water walls, etc.), electrical system (mainly steam turbine generators, main transformers, etc.), control systems, etc.

The first two produce high-temperature and high-pressure steam; The electrical system realizes the transformation from thermal energy, mechanical energy to electrical energy; The control system ensures the safety of each system.

Rational and economical operation.

3. Nuclear power generation.

The core device of nuclear power generation is a nuclear reactor.

Nuclear reactors are divided into thermal neutron reactors and fast neutron reactors according to the neutron energy that causes fission. Fast neutrons refer to neutrons released by fission reactions. Thermal neutrons are neutrons that are moderated by fast neutrons.

A large number of operating are thermal neutron reactors, which require moderators to pass through its nuclei.

An elastic collision with fast neutrons moderates fast neutrons into thermal neutrons. The materials used in thermal neutron reactors are mainly natural uranium (3% uranium-235 content) and slightly enriched uranium.

Uranium-236 content is about 3%)).

4. Wind power generation.

Converting wind energy into electricity is one of the most basic ways to use wind energy. Wind generator.

Generally, it is composed of wind turbines, generators, tin finders (tails), towers, speed limiting safety mechanisms and energy storage devices. The working principle of a wind turbine is relatively simple, the wind wheel rotates under the action of the wind, which converts the kinetic energy of the wind into the mechanical energy of the wind wheel shaft. The generator is driven by the wind turbine shaft.

5. Manpower generation.

Anything that can generate power can generate electricity, like hydro power and wind power, and human power can also generate electricity. As a result, relapser motors such as hand crank and foot pedals are produced, which convert the energy generated by people in motion into electrical energy.

Summary. The large-scale power supply in the power system is generated by generators, and its mechanical energy is converted into electrical energy, and the mechanical energy is converted into electrical energy by renewable energy sources such as hydropower, wind power, ocean tide, dam water pressure difference, solar energy, and ordinary dry batteries such as coal and oil residue.

Dear, I have received your question. I will reply to you as soon as possible, typing takes time, please wait a moment Hello, a power supply refers to a device that converts other forms of energy into electrical energy.

The large-scale power supply in the power system is generated by the generator, and its mechanical energy is converted into electrical energy, and the mechanical energy is converted into electrical energy by renewable energy such as hydropower, wind power, sea tide nuclear stool, dam water pressure difference, solar energy, etc., as well as the dry battery of burning coal and oil residue.

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Solution: The process of consuming electric energy with an electric banquet device is the process of doing work with electric current, and it is also the process of converting electrical energy into other forms of energy

1) When the fan worker is working slowly, it consumes electrical energy to produce mechanical energy, so it converts electrical energy into mechanical energy;

2) When the electric water heater is working, it consumes electric energy, generates heat energy, and converts electric energy into internal energy;

3) When the rice cooker is working, it consumes electric energy, generates heat energy, and converts electric energy into internal energy;

4) When the electric soldering iron is working, it consumes electric energy, generates hot search file silver energy, and converts electrical energy into internal energy;

5) When the fluorescent lamp works, it consumes electric energy and produces light energy, so it is the process of converting electrical energy into light energy;

Therefore, the answer is: (1) mechanical energy; (2) internal energy; (3) internal energy; (4) internal energy; (5) light energy;

5. What energy can the following electrical appliances convert into when they are working?

1) Electric fan: Electricity is converted to

2) Electric Water Heater: Electricity is converted to

3) Rice cooker: Electricity is converted to

4) Soldering iron: Electricity is converted to

5) Fluorescent lamp: Electricity is converted to