The phenomenon of electromagnetic induction is considered a major revolution in the field of engineering applications. Learn about what electromagnetic induction is and its applications in the article below.
Electromagnetic Induction
Electromagnetic induction is the appearance of an induced current in a closed circuit when the magnetic flux through that circuit varies. The electromotive force generated by the induced current in the closed circuit is called induced electromotive force. This is the core principle that helps current 220v electric cookers operate stably and efficiently in Vietnamese households.
Law
- The basic law of electromagnetic induction: When there is a change in magnetic flux through the boundary of a closed circuit, an induced electromotive force appears in the circuit.
- Lenz’s Law: The induced current flows in such a direction that the magnetic field opposes the cause that produced it.
- Faraday’s Law: The induced electromotive force is the electromotive force generated by the induced current in the closed circuit; it is proportional to the rate of change of magnetic flux through the circuit and inversely proportional to the time of that change (i.e., it is proportional to the rate of change of magnetic flux).
Applications of Electromagnetic Induction
The phenomenon of electromagnetic induction is an extremely useful phenomenon with many applications in life. Electromagnetism has created a major revolution in the field of engineering applications. Not only that, it also has a significant impact on other fields such as medicine, industry, space…
Household Appliances
Electromagnetism plays a fundamental working principle for many household appliances such as lights, kitchen devices, air conditioning systems, etc.
Induction Cookers
Induction cookers heat pots using electromagnetic induction, instead of conducting heat from flames or electric heating elements. Because the induced current directly heats the cooking utensils, the temperature can rise very quickly.
In an induction cooker, a copper coil is placed under an insulating material (usually a ceramic glass cooktop), and an alternating current is passed through this copper coil.
The oscillating magnetic field creates a continuous magnetic flux in the pot, and at this point, the pot acts as the magnetic core of a transformer. This generates a large eddy current (also known as Foucault current) inside the pot. Due to the effect of the Foucault current, the cooking pot experiences the effect of electromagnetic braking force, thereby causing the Jun-Lenz heating effect and heating the bottom of the pot as well as the food inside.
Thanks to possessing this smart and superior heating principle, this product line is gradually completely replacing traditional gas stoves. Currently, to meet the diverse needs of families, manufacturers have developed many different design lines. You can refer to more information about popular types of induction cookers on the market – from compact single induction cookers for students, elegant built-in double induction cookers for modern families, to high-capacity multi-zone cookers – to provide the most optimal installation solutions.
When purchasing, consumer trends often focus on imported brands. Before deciding to spend money, you should actively refer to the ranking of the top 10 durable induction cooker brands in Europe today to choose a device that has full CO/CQ certification along with E.G.O induction coils meeting German standards, helping to maximize the lifespan of the cooker.
Fluorescent Lights
The most commonly used lighting systems in homes and commercial buildings are fluorescent lighting systems.
The ballast used in fluorescent lights operates based on electromagnetic principles; at the moment the light is turned on, it generates a high voltage across the two ends of the light, causing discharge through the light.
The current through the light creates ions that act on the phosphor powder, causing the light to glow. (after the light is on, the voltage across the two ends of the light decreases, and the current through the light is limited by the inductance of the ballast)
Electric Fans
Electric fans and other cooling systems use electric motors. These motors operate based on the principle of electromagnetic induction. In any electrical device, electric motors operate by the magnetic field created by the current according to the Lorentz force principle. These motors only differ in size and cost based on application.
In addition, there are many applications of the phenomenon of electromagnetic induction in household appliances such as: microwaves, blenders, ovens, doorbells, speakers, etc…
Applications in Industry
Generators
Generators use mechanical energy to generate electricity. The “heart” of a generator is a coil in a magnetic field. The operating principle of a generator is that an electric coil rotated in a magnetic field at a constant speed will generate alternating current.
Instead of using a rotating coil in a constant magnetic field, there is another way to use electromagnetic induction, which is to keep the coil stationary and rotate a permanent magnet (providing the magnetic field and magnetic flux) around the coil.
Maglev Trains
This is one of the modern technologies of transportation systems using the phenomenon of electromagnetic induction. Maglev trains use strong electric magnets to accelerate the train to an incredible speed.
Maglev trains use the basic principles of magnets such as the electromagnetic suspension system (EMS) and the electrodynamic suspension system (EDS). In EMS, the electromagnets used on the train body will attract to the iron rails. These magnets surround the guiding rails, and the gravitational force between the guides and the magnets lifts the train. In EDS, the train is pushed by the thrust in the guiding rails by the induced current.
Medicine
Today, electromagnetic fields play an important role in advanced medical devices such as hyperthermia treatment methods for cancer, implants, and magnetic resonance imaging (MRI).
Above are the shares of Kocher induction cookers about the phenomenon of electromagnetic induction and its applications in life. Kocher is proud to be a pioneer in Vietnam bringing German technology into induction cooker products. We hope the information in this article has helped you understand more about the phenomenon of electromagnetic induction and its important role in daily life.
