What Is Electromagnetic Induction?
Electromagnetic induction (Electromagnetic induction) phenomenon refers to the conductor placed in the changing magnetic flux, which will generate electromotive force. This electromotive force is called induced electromotive force or induced electromotive force. If this conductor is closed into a loop, the electromotive force will drive electrons to form an induced current (induced current). Michael Faraday is generally considered to have discovered electricity in 1831 People of magnetic induction, although Francesco Zantedeschi's work in 1829 may have foreseen this.
- In 1831, a scientist named Michael Faraday discovered the interconnection and transformation between magnetism and electricity. Whenever the magnetic flux passing through the closed circuit changes, an induced current is generated in the closed circuit. This phenomenon of generating a current using a magnetic field is called electromagnetic induction, and the current generated is called an induced current.
- There are two conditions for the occurrence of electromagnetic induction (one is indispensable).
- l Close the circuit.
- l The magnetic flux passing through the closed circuit changes.
- There are two ways to change the magnetic flux, as shown in Figure 1. One method is to let the conductor in the closed circuit perform the motion of cutting the magnetic induction wire in the magnetic field; the other method is to let the magnetic field move inside the conductor.
- The electromagnetic induction part involves three aspects of knowledge:
- The first is the law of electromagnetic induction. What electromagnetic induction studies is its
- 1. [Calculation formula of the magnitude of the induced electromotive force]
- 1) E = n / t (universal formula) {Faraday's law of electromagnetic induction, E: induced electromotive force (V), n: number of turns of the induction coil, / t: rate of change of magnetic flux}.
- 2) E = BLVsinA (cut
- Faraday's experiments show that as long as the magnetic flux passing through the closed circuit changes, a current is generated. This phenomenon is called electromagnetic induction, and the current produced is called induced current.
- Faraday summarized the following law based on a large number of experimental facts: the magnitude of the induced electromotive force in the circuit is proportional to the rate of change of the magnetic flux passing through the circuit.
- The induced electromotive force is represented by , that is, = n / t This is the Faraday's law of electromagnetic induction.
- Electromagnetic induction is one of the most significant discoveries in electromagnetics, and it reveals the interconnections between electrical and magnetic phenomena. The significance of Faraday's law of electromagnetic induction is that, on the one hand, according to the principle of electromagnetic induction, people have manufactured generators, and large-scale production and long-distance transmission of electrical energy become possible; on the other hand, the phenomenon of electromagnetic induction in electrical and electronic technology As well as electromagnetic measurement, it has a wide range of applications. Human society has since entered the era of electrification.