Electromagnetic induction was discovered in 1831 by Michael Faraday by demonstrating his ability to generate an electric current induced from a magnetic field. This discovery led to the construction of generators.
What is electromagnetic induction?
Electromagnetic induction is the generation of electricity by the creation of electric currents through time-varying fields. In other words, the production of this electricity is achieved by magnetism.
Magnetic field flux, in other words, when the number of magnetic field lines in an electric current changes. According to the International System, the magnetic field is represented by flux (Wb).
Magnetic flux is represented by Φ and the number of lines passing through the surface can be calculated:
Φ = (N) · B ·S · -cos (α)
– N = Number of turns
– B = Magnetic field represented in the teslas
– Surface area shown as S = m 2
The conservation of electromagnetic induction energy is given by Lenz’s law, which states that the magnetic field is in the opposite direction to the flux. In addition to Lenz’s law, we can also find Faraday’s law.
Electromagnetic induction is reflected in Faraday’s law and Lenz’s law. Currently, these two laws are based on electromagnets and explain them. Unlike Lenz’s law, Faraday’s law states the variation of magnetic flux over time. The voltage in the electrical circuit is directly proportional to the change in the time when the flux passes through a surface.
What is Electromagnetic Interference?
Electromagnetic interference is the same as electromagnetic induction except for the small difference between using an electromagnet or a stable magnet instead of a magnet. Electromagnetic induction sensors are used in different fields such as science and geophysics.
There are two groups:
- Intentional = this type of group is characterized by signals that are consciously emitted for the purpose of generating interference.
- Unintentional = an electromagnetic interference group that accidentally generates interference and as a result obtains an undesirable effect.
In addition to this classification, we can also find:
- Emitted interference = an interference is considered emitted when the signal is emitted through electromagnetic radiation in the air between the source and the victim.
- Transmitted interference = such interference occurs when interference is propagated through the common relationship between the transmitter and the receiver of the initiative. They are spread through a cable.
