Where to use electromagnets. Electromagnets and their application

There are four fundamental forces of physics, and one of them is called electromagnetism. Conventional magnets are of limited use. An electromagnet is a device that creates a magnetic field during the passage of an electric current. Since electricity can be turned on and off, the same goes for the electromagnet. It can even be weakened or strengthened by reducing or increasing the current. Electromagnets find their application in various everyday electrical appliances, in various fields of industry, from conventional switches to propulsion systems of space vehicles.

What is an electromagnet?

The electromagnet can be considered as a temporary magnet that functions with the flow of electricity, and its polarity can be easily changed by changing the direction of the current. Also, the strength of the electromagnet can be changed by changing the magnitude of the current flowing through it.

The scope of electromagnetism is unusually wide. For example, magnetic switches are preferred in use in that they are less susceptible to temperature changes and are able to maintain a rated current without false triggering.

Electromagnets and their application

Here are some of the examples where they are used:

• Motors and generators. Thanks to the electromagnets it became possible to produce electric motors and generators, which operate on the principle of electromagnetic induction. This phenomenon was discovered by the scientist Michael Faraday. He proved that the electric current creates a magnetic field. The generator uses external force of wind, moving water or steam, rotates the shaft, which forces a set of magnets around the spiral wire to create an electric current. Thus, electromagnets convert other types of energy into electrical energy.
• Practice of industrial use. Only materials made of iron, nickel, cobalt or their alloys, as well as some natural minerals react to the magnetic field. Where are the electromagnets used? One of the areas of practical application is the sorting of metals. Since these elements are used in production, iron-containing alloys are efficiently sorted using an electromagnet.
• Where are the electromagnets used? With their help, you can also raise and move massive objects, for example, cars before recycling. They are also used in transportation. Trains in Asia and Europe use electromagnets to transport cars. This helps them to move at phenomenal speeds.

Electromagnets in everyday life

Electromagnets are often used to store information, since many materials are capable of absorbing a magnetic field, which can be subsequently read to retrieve information. They find application in almost any modern instrument.

Where are the electromagnets used? In everyday life they are used in a number of household appliances. One of the useful characteristics of an electromagnet is the possibility of changing the magnetic force when the force changes and the direction of the current flowing through the coils or windings around it. Columns, loudspeakers and tape recorders are devices in which this effect is realized. Some electromagnets can be very strong, and their strength can be regulated.

Where are the electromagnets used in life? The simplest examples are doorbells and electromagnetic locks. Electromagnetic locking is used for the door, creating a strong field. As long as the current passes through the electromagnet, the door remains closed. Televisions, computers, cars, elevators and copiers - that's where electromagnets are used, and this is not a complete list.

Electromagnetic forces

The strength of the electromagnetic field can be controlled by changing the electrical current passing through the wires wrapped around the magnet. If you change the direction of the electric current, the polarity of the magnetic field also changes to the opposite. This effect is used to create fields in a tape or hard disk of a computer for storing information, as well as in loudspeakers of acoustic speakers in radio, TV and stereo systems.

Magnetism and electricity

The dictionary definitions of electricity and magnetism are different, although they are manifestations of the same force. When electric charges move, they create a magnetic field. Its change, in turn, leads to the appearance of an electric current.

The inventors use electromagnetic forces to create electric motors, generators, MRI devices, levitating toys, consumer electronics and many other priceless devices, without which it is impossible to imagine the daily life of a modern person. Electromagnets are inextricably linked with electricity, they simply can not work without an external power source.

Application of lifting and large-scale electromagnets

Electric motors and generators are vital in the modern world. The motor takes electrical energy and uses a magnet to turn electrical energy into kinetic. The generator, on the contrary, transforms the motion, using magnets, to generate electricity. When moving oversized metal objects, lifting electromagnets are used. They are also necessary for sorting scrap metal, for separating cast iron and other ferrous metals from non-ferrous metals.

The real miracle of technology is the Japanese levitating train, capable of speeds of up to 320 kilometers per hour. It uses electromagnets that help to soar in the air and move incredibly fast. The US Navy conducts high-tech experiments with a futuristic electromagnetic rail gun. It can direct its projectiles to considerable distances at great speed. Shells have enormous kinetic energy, so they can hit targets without the use of explosives.

The concept of electromagnetic induction

In the study of electricity and magnetism, the concept of electromagnetic induction is important. Induction occurs when a flow of electricity occurs in a conductor in the presence of a changing magnetic field. The use of electromagnets with their induction principles is actively used in electric motors, generators and transformers.

Where can electromagnets be used in medicine?

Magnetic resonance tomographs (MRI) also work with the help of electromagnets. This is a specialized medical method for examining the internal organs of man, which are not available for immediate examination. Along with the main one, additional gradient magnets are used.

Where are the electromagnets used? They are present in all kinds of electrical devices, including hard drives, speakers, motors, generators. Electromagnets are used everywhere and, despite their invisibility, occupy an important place in the life of modern man.