The phenomenon of electromagnetic induction means that when the magnetic field changes, electromotive force and induced current will be generated nearby. The principle is Faraday's law of electromagnetic induction, that is, when the magnetic flux changes, an induced electromotive force will be generated in the conductor. This phenomenon is divided into two categories: kinetic electromotive force (generated by the movement of a conductor in a magnetic field) and transformer electromotive force (generated by magnetic flux passing through a conductor). The phenomenon of electromagnetic induction is widely used in the field of electrical engineering.
What is the phenomenon of electromagnetic induction?
The phenomenon of electromagnetic induction refers to the phenomenon that when the magnetic field changes, electromotive force and induced current will be generated near it. That is, when the magnetic flux changes, an induced electromotive force is generated in the conductor.
Principle:
The phenomenon of electromagnetic induction is based on Faraday’s law of electromagnetic induction:
<code>ε = -dΦ/dt</code>
where:
- ε is Induced electromotive force
- Φ is the magnetic flux (the product of the magnetic field strength passing through the loop and the area of the loop)
- t is the time
When the magnetic flux Φ changes with time t When, an induced electromotive force ε will be generated in the loop.
Type:
Electromagnetic induction phenomena are mainly divided into two categories:
- Kinematic electromotive force: The conductor is Movement in a magnetic field produces an induced electromotive force. For example, in a generator, the rotor moves in the magnetic field of the stator, generating dynamic electromotive force.
- Transformer electromotive force: The induced electromotive force generated by magnetic flux passing through a conductor. For example, in a transformer, when the current in the primary coil changes, an alternating magnetic field is generated, and a transformer electromotive force is generated in the secondary coil.
Application:
The phenomenon of electromagnetic induction has a wide range of applications in electrical engineering, such as: generators, motors, transformers, induction furnaces, etc.
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