1. This is Oersted's experiment: electromagnetism, that is to say that there is a magnetic field around the current, which is the magnetic effect of the current. The application is excited solenoid and electromagnet (solenoid with an iron core), and electromagnetic. Iron applications include electromagnetic cranes, electromagnetic relays, loudspeakers, etc.
2. This is Faraday's experiment: magnetism generates electricity, also known as the phenomenon of electromagnetic induction. Its applications are generators, dynamic microphones (microphones) and transformers.
3. It is the force movement of the conductor under tension in the magnetic field, and its application is the electric motor.
The relationship between magnetism and electricity
It is exactly the opposite, the microphone picks up the sound and the speaker amplifies the sound.
Dynamic microphones use principle of electromagnetic induction. The metal coil is mounted on the diaphragm and then placed between the magnetic field of the magnet. As sound pressure changes, it continually moves within the magnetic field. generate an induced current. Convert sound signals into electrical signals. Its transduction principle is very similar to that of a loudspeaker.
Audix dynamic microphone
What devices are used to convert mechanical energy and electromagnetic energy between them?
Magnetic phenomena and electrical phenomena are reciprocal
Electric energy generates magnetism
: electrified wires will produce magnetic fields, such as electromagnets, motors, audio speakers, etc.
Magnetism can produce electricity; when part of the conductor in a closed loop moves in the magnetic field and intersects the mag field linesnetic, current will be generated, like
generators, microphones, etc
A generator is a device that converts mechanical energy into secondary energy - electrical energy. According to Faraday's law of electromagnetic induction, the coil (rotor) of the generator rotates in the magnetic field (stator) to generate an electromotive force. For example, the potential energy of water can be converted into kinetic energy to drive a water turbine, moving air flow drives a steam turbine, wind energy drives a windmill, etc. The rotating part of these devices drives the rotor to produce electricity. Three-phase two-pole alternators are commonly used.
Portable wind turbines are commonplace in everyday life.
The electric motor is the reverse device of the generator and is mainly composed of two sets of coils. A fixed group is called a stator, which is used forr generate a magnetic field; the other rotating group is called rotor. The rotor induces or passes current and rotates due to magnetic torque in the stator's magnetic field, thereby converting electricity. energy into mechanical energy for production. A coil assembly can also be replaced with reluctance or permanent magnet materials.
In everyday life, electric motors are found in elevators, electric bicycles, electric cars, treadmills, shavers, air conditioning compressors and electric fans.