How is the electrical energy of an electric fan converted into kinetic energy?

After the electric fan is connected to the power supply, it drives the motor through electric energy to drive the fan blades to rotate. Converts electrical energy into kinetic energy.

Strictly speaking, the electric fan converts electrical energy into mechanical energy and thermal energy, because heat does work, and at the same time that the electrical energy is converted into the mechanical energy of the blade rotation, heat energy will be generated. Moreover, no machine can achieve 100% mechanical efficiency at present, so it is guaranteed to generate thermal energy.

The electricity generates a magnetic field through the fan coil, and the coil of the motor stator is arranged within 360 degrees according to the technical requirements, and there is an alternating magnetic field generated in the three-phase alternating current [or single-phase] ** circle, and there is a small change in the stator to form a chase, and the rotor is rotated by sucking.

It is really difficult to understand in detail, and can only be used as an analogy, electrical energy is like potential energy (an object in the sky), when electrons flow through the coil, its electric potential energy decreases and is converted into magnetic energy, (the coil itself has resistance, so part of it is converted into heat energy) Magnetic energy drives the motor to rotate. Just like an object falling from high in the air, the potential energy decreases and is converted into kinetic energy, (the object rubs against the air, and part of it is converted into heat energy) the object has a certain velocity.

In fact, the coil in the motor is energized so that the electrical energy is first converted into magnetic energy, and then due to the magnetic force, the fan rotates, so that the magnetic induction intensity of the magnetic field in the motor changes, and at the same time, the magnetic energy is converted into the mechanical energy of the fan.

The electrical energy generates a magnetic field through the coil, and the stator cuts the magnetic field lines to generate power to drive the blades.

Imagine using electricity to drive an electric fan, and then use the kinetic energy of the electric fan to convert back to electrical energy? There's nothing wrong with the principle, it just sounds a little awkward!!

Electric fans convert electrical energy into kinetic energy and heat energy when they work.

First, the principle of the electric fan is that the energized coil rotates under force in the magnetic field. The form of energy conversion is: electrical energy is mainly converted into mechanical energy, and at the same time, because the coil has resistance, it is inevitable that some electrical energy will be converted into thermal energy.

The most important hardware of the electric fan is the motor, and only the rotation of the motor can drive the fan blades to rotate.

Second, the electric fan relies on the motor to drive the fan blades to work. When the motor drives the fan blade to rotate, the fan blade will encounter air resistance, and the air will be pushed forward along the axial direction because the fan blade angle is much lower than 90 degrees.

Third, the shape of the fan blade is selected, the fan speed is high, the power is large, the fan blade is more and more slender, and the high-power fan adopts the shape of the slender fan blade. After the electric fan is energized, the positive and negative alternating currents of the alternating current generate a magnetic field, which prompts the energized coil of the motor to rotate under force, and the rotating shaft and the fan blades rotate, which is converted from electrical energy to mechanical energy. In the process of energy transformation, a part of the energy is transformed into a hot hall and emitted heat.

Fourth, we use electric fans to cool down, not because the electric fan itself can be used for cooling, not only does it not cool, but the electric fan will also increase heat due to energy conversion. An electric fan can make you feel cool. However, when a person feels hot, it will expel sweat outward, and the fan will accelerate the flow of air to promote the evaporation of sweat, absorbing the heat from the body to achieve cooling.

The electric fan is mainly converted into mechanical energy (wind energy or kinetic energy), and a small amount of electrical energy is converted into heat energy.

A fan is mainly composed of components such as a fan head, blades, grille, and controls. The fan head includes an electric motor, front and rear end covers, and a moving head air supply mechanism. The main components of an electric fan are:

AC motors. Its working principle is that the energized coil rotates under force in a magnetic field.

Electrical energy is converted into mechanical energy, and at the same time, due to the resistance of the coil, it is inevitable that some of the electrical energy will be converted into thermal energy.

Electrical energy is converted into mechanical energy (kinetic energy).

The process of working with electrical appliances is the process of transforming electrical energy into other forms of energy; When the rice cooker works normally, it mainly converts electrical energy into internal energy; When the current is passed through an electric fan, the electrical energy is mainly converted into mechanical energy

Therefore, the answer is: internal energy; Mechanical energy

After the power is on, the electric fan can rotate, indicating that the electrical energy can be converted into (rock burning kinetic energy) (mechanical energy can also be filled).

The vertical section of the fan blade is consumed and rotates blindly.

Electrical energy Kinetic energy (mechanical energy).

Analysis] When the electric fan is working, it is mainly the mechanical energy that converts the electric energy into the electric fan. 【Comments】 Pay attention to the word "main" in the title. Although the electrical energy is converted into the mechanical energy and internal energy of the electric fan when the electric fan is working, the mechanical energy is the main part.

Once you understand what is mechanical energy and what is kinetic energy, it becomes clear.

a. Electric fan.

When working, electrical energy is consumed and mechanical energy is obtained.

So convert electrical energy into mechanical energy; therefore a is correct;

b. The process of charging the lead-acid battery consumes electrical energy and obtains chemical energy.

So convert electrical energy into chemical energy; Therefore berror;

c. When the generator generates electricity, it consumes mechanical energy and obtains electrical energy, so the mechanical energy is converted into electrical energy; Therefore c is correct;

d. When the electric kettle is working, the electric energy is consumed, so that the temperature of the water rises and the internal energy is obtained, so the electric energy is converted into internal energy; Therefore d is correct

Therefore, choose B