Wiktor Wise
The conversion of magnetism to electricity is a fundamental concept in physics, with Michael Faraday's discovery of electromagnetic induction in 1831 being a pivotal moment in our understanding of this relationship. This phenomenon has been applied in various inventions, including electric generators, which convert mechanical energy into electrical energy. Electric generators typically have two parts: the field winding and the armature. The discovery of electromagnetic induction has also paved the way for new research in spin current conversion, where spin current is transformed into electric current using organic polymer semiconductors and the inverse spin Hall effect. This has potential applications in future generations of batteries, solar cells, and electronic devices. While magnetism itself is not a source of energy, it plays a crucial role in energy conversion and the functioning of electric motors and transformers.
| Characteristics | Values |
|---|---|
| How do magnets convert to electricity? | Electromagnetic induction |
| Who discovered electromagnetic induction? | Michael Faraday |
| What did Michael Faraday produce? | The first electromagnetic generator, the Faraday disk |
| What is electromagnetic induction? | The process by which an electrical wire cutting across magnetic lines of force produces a current in the wire |
| What is a galvanometer? | An instrument that can measure electric current in wires |
| What is the first law of thermodynamics? | Energy can be converted from one kind to another but cannot be created or destroyed |
| What is magnetism? | A force with no energy of its own |
| What is spin current? | A phenomenon where spin waves in an iron magnet, created by an external magnetic field and pulses of microwaves, are converted to electric current at copper electrodes |
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Electric generators
The first electromagnetic generator, the Faraday disk, was also invented by Faraday. It was made from a copper disk rotating between the poles of a horseshoe magnet to produce electric currents. Faraday's discovery led to the design of the electromagnetic generators used today. These generators use an electromagnet, which is a magnet produced by electricity, rather than a traditional magnet.
Generators are capable of producing both AC and DC power. Alternators, which generate AC, are generally more economical and are used in smaller load applications like automobiles. On the other hand, dynamos produce pulsing DC through the use of a commutator.
There are various types of electric generators, including gas-powered generators, steam turbines, wind turbines, hydroelectric turbines, and solar photovoltaic systems. Gas-powered generators use an internal combustion engine to spin a shaft that rotates an electromagnet, producing an electric current through copper wiring. Wind turbines use the power of the wind to move rotor blades and power a generator, while hydroelectric turbines use the force of moving water to spin turbine blades. Solar photovoltaic cells convert sunlight directly into electricity and can be used for various applications, from powering small devices to large power plants.
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Transformers
A transformer typically consists of two coils of wire wound on a metal core. The primary coil is connected to a source of electrical power, while the secondary coil supplies power to a load. When an alternating voltage is applied to the primary coil, it creates a changing magnetic field in the core, which induces an electromotive force (EMF) in the secondary coil. This process is known as electromagnetic induction, where a coil of wire induces a voltage in another coil in close proximity to it. The direction of the induced current depends on how the coil is moved.
The iron core of the transformer is usually a complete ring, with the primary and secondary coils wound around it. Iron is a conductor, so the core is made of thin sheets clamped together, with each sheet coated to make it a poor conductor. This design prevents induced voltages from driving wasteful secondary currents in the core. The primary and secondary coils are connected by the magnetic field in the iron core, and a change in current in the primary coil induces a corresponding change in the secondary coil.
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Electric motors
The two main components of an electric motor are the stator and the armature (also called a rotor). The power supplied to the motor passes through the stator, which contains coils that generate a magnetic field. The armature generates its own magnetic field, and these two fields interact with and push against each other to create rotational motion. This force is applied to the motor's shaft, which causes it to rotate and continue transmitting power.
There are two main types of electric motors: alternating current (AC) and direct current (DC). Alternating current periodically reverses the current direction, while direct current flows in one direction only. AC motors are generally more powerful and require less maintenance, while DC motors tend to be highly efficient. The type of motor used depends on the specific application.
The development of electric motors began in the 1740s with experimental electrostatic motors. The first electric motor capable of turning machinery was invented by William Sturgeon in 1832. However, due to the high cost of battery power, these early motors were not commercially successful. In 1886, Frank Julian Sprague invented the first practical DC motor, which could maintain a relatively constant speed under variable loads. Sprague's inventions improved electric distribution and led to the development of the first electric trolley system, electric elevator, and electric subway.
Today, electric motors are ubiquitous, powering a wide range of devices from household appliances to industrial machinery. They play a crucial role in various sectors, including agriculture, where they have eliminated the need for human and animal muscle power in tasks such as grain handling and water pumping.
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Spin current
The spin current is described by a second-rank tensor qij, where the first index refers to the direction of flow, and the second refers to the spin component flowing. The spin-orbit interaction between the spin and charge currents is described by introducing a single dimensionless coupling parameter. The spin Hall effect, a vital phenomenon in spin-orbit coupling, involves the appearance of spin accumulation on the lateral surfaces of an electric current-carrying sample, with opposing boundaries exhibiting opposite spin directions. This effect was first predicted by Russian physicists Mikhail I. Dyakonov and Vladimir I. Perel in 1971 and experimentally demonstrated in 1984.
The conservation quantities and continuity equations of spin currents have been analysed in different cases, including non-relativistic approximation forms to explain their physical meanings. The spin-orbit coupling term in semiconducting media is deduced based on the theory of electrodynamics in moving media. The total angular momentum current is recommended to describe the distribution of polarization and transport properties in spintronics accurately.
Spintronics has the potential to revolutionise electronic devices by reducing power consumption and surpassing the velocity limit of electric charge. Spin currents enable the transmission of more information in quantum computation and quantum information processing. Experimental progress in spintronics has been made, with spin transistors being one of the fundamental designs in this field.
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Magnetic force
The electromagnetic force is one of the four fundamental forces of nature and is responsible for many of the chemical and physical phenomena observed daily. Electricity and magnetism, while once considered separate forces, are now understood to be closely intertwined phenomena that make up electromagnetism.
Magnetic fields, a key component of electromagnetism, are produced by moving electric charges and the intrinsic magnetic moments of elementary particles associated with a fundamental quantum property, their spin. The force on an electric charge depends on its location, speed, and direction. The magnetic field, or B-field, describes the component of the force that is proportional to both the speed and direction of charged particles.
The strength of the magnetic force on a charge is proportional to the speed at which the charge is moving through the field. The direction of the force on the charge can be determined by a mnemonic known as the right-hand rule. If the thumb is pointed in the direction of the current, and the fingers in the direction of the magnetic field, the resulting force on the charge points outwards from the palm.
Magnets can also generate electricity through electromagnetic induction, which is utilised in electric generators, transformers, and electric motors. This phenomenon was discovered by Michael Faraday in 1831, leading to the creation of the Faraday disk, the first electromagnetic generator.
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Frequently asked questions
Magnets can generate electricity through electromagnetic induction.
Electromagnetic induction is the process of moving a wire through a magnetic field, producing a current in the wire.
Electric generators, transformers, and electric motors all use electromagnetic induction to convert mechanical energy into electrical energy.
Michael Faraday produced the first electromagnetic generator, the Faraday disk, in 1831.
Spin current is a magnetic spin current that can be converted into electric current using organic polymer semiconductors and the inverse spin Hall effect.
