Umair Gaines
Electromagnetic induction, also known as magnetic induction, is a process that uses the relationship between electricity and magnetism to generate voltage and electric current. The rate of induction is influenced by various factors, including the number of turns of wire in a coil, the velocity of the magnetic field change, and the flux density. Faraday's law of induction, discovered by Michael Faraday in 1831, describes the relationship between the induced voltage in a circuit and the rate of change of the magnetic flux over time. This law has been further developed and applied in various fields, including electrical generators and motors, as well as many other electrical devices and systems.
| Characteristics | Values |
|---|---|
| Discovery | Michael Faraday in 1831, later documented mathematically by James Clerk Maxwell |
| Process | Using magnetic fields to produce voltage, and in a closed circuit, a current |
| Formula | The magnitude of the electromagnetic induction is directly proportional to the flux density, the number of loops giving a total length of the conductor, and the rate or velocity at which the magnetic field changes within the conductor |
| Applications | Electrical generators, microphones, electric guitars, transformers, motors, and other electrical machines |
| Other names | Electrical induction, magnetic induction |
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What You'll Learn
Faraday's Law of Induction
Michael Faraday, an English scientist, proposed the law of electromagnetic induction in 1831. Faraday's law is a quantitative relationship expressing that a changing magnetic field induces a voltage in a circuit. This phenomenon is known as electromagnetic induction.
Faraday performed three main experiments to discover electromagnetic induction. In his first experimental demonstration, on August 29, 1831, he wrapped two wires around opposite sides of an iron ring, forming a primitive toroidal transformer. When he connected one coil to a battery, he observed a brief deflection in a galvanometer attached to the second coil. He concluded that a changing current in the first coil created a changing magnetic field in the ring, which in turn induced a current in the second coil.
Faraday's first law of electromagnetic induction states that whenever a conductor is placed in a varying magnetic field, an electromotive force (emf) is induced. If the conductor circuit is closed, a current is induced, known as an induced current. This can be achieved by rotating the coil relative to the magnet, moving the coil into or out of the magnetic field, changing the area of a coil placed in the magnetic field, or moving a magnet towards or away from the coil.
Faraday's second law of electromagnetic induction quantifies the emf produced in the conductor and states that the induced emf in a coil is equal to the rate of change of flux linkage. The flux linkage is the product of the number of turns in the coil and the flux associated with the coil.
Faraday's law has many practical applications, including electrical components such as inductors and transformers, and devices such as electric motors, generators, and induction cookers.
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Electric motors, generators and transformers
Electric motors, generators, and transformers are devices that operate based on the principles of electromagnetic induction, which was discovered by Michael Faraday in 1831. This phenomenon involves the production of an electromotive force (EMF) across an electrical conductor in a changing magnetic field.
Electric Motors
Electric motors are devices that convert electrical energy into mechanical energy. They consist of loops of wire in a magnetic field. When an electric current is passed through these loops, the magnetic field exerts a torque on the loops, causing a shaft to rotate. This process transforms electrical energy into mechanical work. Electric motors are commonly used in applications where magnetic force is applied to current-carrying wires.
Electric Generators
Electric generators operate on the principle of electromagnetic induction, where relative motion between a conductor and a magnetic field induces a voltage in a circuit. Generators use mechanical energy sources, such as falling water, steam, or wind, to turn a coil within the generator. This mechanical energy is then converted into electrical energy. The coil, when rotated in a magnetic field, induces a current to flow, generating electrical power.
Transformers
Transformers are devices that transform voltages from one value to another. They are designed based on Faraday's law of induction. A step-up transformer increases the voltage to transmit power over long distances, while a step-down transformer decreases the voltage for local distribution and user safety. Transformers play a crucial role in the transmission and distribution of electrical power, ensuring efficient energy transfer with minimal losses.
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Induced voltage
Electromagnetic induction is the process of using magnetic fields to produce voltage, and in a closed circuit, a current. This process was discovered by Michael Faraday in 1831 and is also known as Faraday's law of induction.
Faraday's law states that a voltage is induced in a circuit whenever there is relative motion between a conductor and a magnetic field. The magnitude of this induced voltage is directly proportional to the speed or velocity of the movement. This means that the faster the movement of the magnetic field, the greater the induced voltage or electromotive force (emf) in the coil.
The induced voltage is also influenced by the number of turns of wire in the coil. By increasing the number of individual conductors cutting through the magnetic field, the amount of induced emf produced is the sum of all the individual loops of the coil.
The induced voltage in a magnetic field due to a conductive liquid moving at velocity v is given by the formula ε = B*v, where ε is the induced voltage, B is the magnetic field, and v is the velocity of the conductive liquid.
Eddy currents are circular currents induced within electrical conductors by electromagnetic induction. They occur when a solid metallic mass is rotated in a magnetic field, causing electric currents between points of greatest and least potential. Eddy currents are useful in applications such as eddy current brakes and induction heating systems, but they can also be undesirable in certain devices as they dissipate energy and cause a rise in temperature.
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Eddy currents
Electromagnetic induction is the process of using magnetic fields to produce voltage and, in a closed circuit, a current. The rate of induction electricity is proportional to the flux density, the number of loops giving a total length of the conductor, and the rate or velocity at which the magnetic field changes within the conductor.
Electromagnetic induction was discovered by Michael Faraday and published in 1831. Faraday's law of induction states that a voltage is induced in a circuit whenever there is relative motion between a conductor and a magnetic field. The magnitude of the induced voltage is proportional to the rate of change of the flux.
Faraday's law describes two phenomena: the motional electromotive force (emf) generated by a magnetic force on a moving wire, and the transformer emf generated by an electric force due to a changing magnetic field.
One of the applications of electromagnetic induction is in electrical generators. When a permanent magnet is moved relative to a conductor, an electromotive force is created. If the wire is connected through an electrical load, current will flow, and electrical energy is generated.
Another application of electromagnetic induction is in the creation of eddy currents. Eddy currents are loops of electric current induced within conductors by a changing magnetic field or by the relative motion of a conductor in a magnetic field. They are called eddy currents because they resemble swirling eddies in a stream. Eddy currents flow in closed loops, in planes perpendicular to the magnetic field.
The magnitude of the current in an eddy current loop is proportional to the strength of the magnetic field, the area of the loop, and the rate of change of flux, and inversely proportional to the resistivity of the material. According to Lenz's law, an eddy current creates a magnetic field that opposes the change in the magnetic field that created it. This opposition to the change in the magnetic field results in a drag force that opposes the motion of the magnet.
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Michael Faraday's discovery
Michael Faraday, born on 22 September 1791, was an English chemist and physicist. He is known for his contributions to the study of electrochemistry and electromagnetism. Faraday's main discoveries include the principles underlying electromagnetic induction, diamagnetism, and electrolysis. Faraday's work laid the foundation for electric motor technology.
Faraday's discovery of electromagnetic induction came in 1831, two years after the death of his mentor Davy. Faraday's breakthrough came when he wrapped two insulated coils of wire around an iron ring. He found that passing a current through one coil induced a momentary current in the other coil. This phenomenon is now known as mutual inductance. In subsequent experiments, he found that moving a magnet through a loop of wire induced an electric current in the wire. He also discovered that the same current was induced if the loop was moved over a stationary magnet. Faraday's discovery established that a changing magnetic field produces an electric field.
Faraday's discovery was mathematically modelled by James Clerk Maxwell as Faraday's law, which became one of the four Maxwell equations. Faraday's law describes two phenomena: the motional electromotive force (emf) generated by a magnetic force on a moving wire, and the transformer emf generated by an electric force due to a changing magnetic field. Faraday's law is used to measure the flow of electrically conductive liquids and slurries using magnetic flow meters.
Faraday's work on electromagnetic induction led to the development of electrical components such as inductors and transformers, as well as devices such as electric motors and generators. Faraday himself constructed the electric dynamo, the predecessor of modern power generators and the electric motor.
Faraday's work on induction was influenced by his earlier experiments in 1824, where he investigated the relationship between magnetic fields and electric currents. He also spent time developing a recipe for optical quality glass, which he used in his studies connecting light with magnetism.
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Frequently asked questions
The rate of induction electricity, or electromagnetic induction, is the rate at which a changing magnetic field generates an electric current in a conductor. Faraday's law of induction states that the induced voltage in a circuit is directly proportional to the rate of change over time of the magnetic flux through that circuit.
The rate of induction electricity is influenced by the flux density, the number of loops in the conductor, the length of the conductor, and the rate or velocity at which the magnetic field changes within the conductor.
The rate of induction electricity can be calculated using Faraday's law of induction, which states that the induced voltage (ε) in a magnetic field (B) due to a conductive liquid moving at velocity (v) is given by the formula: ε = Bv.
