|
Electromagnetic induction is the production of voltage across a conductor situated in a changing magnetic field or a conductor moving through a stationary magnetic field. Image File history File links Solenoid. ...
Electromagnetism is the physics of the electromagnetic field: a field which exerts a force on particles that possess the property of electric charge, and is in turn affected by the presence and motion of those particles. ...
Lightning strikes during a night-time thunderstorm. ...
It has been suggested that this article or section be merged with magnet. ...
A student demonstrating the effects of electrostatics. ...
Electric charge is a fundamental conserved property of some subatomic particles, which determines their electromagnetic interaction. ...
Coulombs torsion balance In physics, Coulombs law is an inverse-square law indicating the magnitude and direction of electrostatic force that one stationary, electrically charged object of small dimensions (ideally, a point source) exerts on another. ...
In physics, the space surrounding an electric charge or in the presence of a time-varying magnetic field has a property called an electric field. ...
In physics and mathematical analysis, Gausss law is the electrostatic application of the generalized Gausss theorem giving the equivalence relation between any flux, e. ...
This article does not cite any references or sources. ...
In physics, the electric dipole moment is a measure of the polarity of a system of electric charges. ...
Magnetostatics is the study of static magnetic fields. ...
In physics, Ampères Circuital law, discovered by André-Marie Ampère, relates the circulating magnetic field in a closed loop to the electric current passing through the loop. ...
Magnetic field lines shown by iron filings In physics, a magnetic field is a solenoidal vector field in the space surrounding moving electric charges and magnetic dipoles, such as those in electric currents and magnets. ...
Magnetic flux, represented by the Greek letter Φ (phi), is a measure of quantity of magnetism, taking account of the strength and the extent of a magnetic field. ...
The Biot-Savart law is a physical law with applications in both electromagnetics and fluid dynamics. ...
A bar magnet. ...
Classical electrodynamics (or classical electromagnetism) is a theory of electromagnetism that was developed over the course of the 19th century, most prominently by James Clerk Maxwell. ...
In electricity, current is the rate of flow of charges, usually through a metal wire or some other electrical conductor. ...
Lorentz force. ...
Electromotive force (emf) is the amount of energy gained per unit charge that passes through a device in the opposite direction to the electric field existing across that device. ...
Faradays law of induction (more generally, the law of electromagnetic induction) states that the induced emf (electromotive force) in a closed loop equals the negative of the time rate of change of magnetic flux through the loop. ...
Displacement current is a quantity related to changing electric field. ...
In electromagnetism, Maxwells equations are a set of equations first presented as a distinct group in the later half of the nineteenth century by James Clerk Maxwell. ...
The electromagnetic field is a physical field that is produced by electrically charged objects and which affects the behaviour of charged objects in the vicinity of the field. ...
Electromagnetic waves can be imagined as a self-propagating transverse oscillating wave of electric and magnetic fields. ...
This article or section does not adequately cite its references or sources. ...
Conduction is the movement of electrically charged particles through a transmission medium (electrical conductor). ...
Electrical resistance is a measure of the degree to which an electrical component opposes the passage of current. ...
Capacitance is a measure of the amount of electric charge stored (or separated) for a given electric potential. ...
Inductance (or electric inductance) is a measure of the amount of magnetic flux produced for a given electric current. ...
Electrical impedance, or simply impedance, is a measure of opposition to a sinusoidal alternating electric current. ...
A resonator is a device or part that vibrates (or oscillates) with waves. ...
It has been suggested that this article or section be merged with Waveguide (optics). ...
Two-dimensional analogy of space-time curvature described in General Relativity. ...
To meet Wikipedias quality standards, this article or section may require cleanup. ...
In physics, the electromagnetic stress-energy tensor is the portion of the stress-energy tensor due to the electromagnetic field. ...
Magnetic field lines shown by iron filings In physics, a magnetic field is a solenoidal vector field in the space surrounding moving electric charges and magnetic dipoles, such as those in electric currents and magnets. ...
International safety symbol Caution, risk of electric shock (ISO 3864), colloquially known as high voltage symbol. ...
In science and engineering, conductors are materials that contain movable charges of electricity. ...
Magnetic field lines shown by iron filings In physics, a magnetic field is a solenoidal vector field in the space surrounding moving electric charges and magnetic dipoles, such as those in electric currents and magnets. ...
Discovery
Michael Faraday is generally credited with having discovered the induction phenomenon in 1831 though it may have been anticipated by the work of Francesco Zantedeschi in 1829[citation needed]. Around 1830 [1] to 1832 [2] Joseph Henry made a similar discovery, but did not publish his findings until later. Michael Faraday, FRS (September 22, 1791 – August 25, 1867) was an English chemist and physicist (or natural philosopher, in the terminology of that time) who contributed significantly to the fields of electromagnetism and electrochemistry. ...
Leopold I 1831 (MDCCCXXXI) was a common year starting on Saturday (see link for calendar). ...
Francesco Zantedeschi (1797 – March 29, 1873) was an italian priest and physicist. ...
Johann Wolfgang von Goethe 1829 was a common year starting on Thursday (see link for calendar). ...
Liberty Leading the People by Eugène Delacroix commemorates the July Revolution 1830 (MDCCCXXX) was a common year starting on Friday (see link for calendar). ...
Year 1832 (MDCCCXXXII) was a leap year starting on Sunday (link will display the full calendar) of the Gregorian Calendar (or a leap year starting on Friday of the 12-day slower Julian calendar). ...
Joseph Henry Joseph Henry (December 17, 1797 – May 13, 1878) was a Scottish-American scientist. ...
Findings Faraday found that the electromotive force (EMF) produced around a closed path is proportional to the rate of change of the magnetic flux through any surface bounded by that path. Electromotive force (emf) is the amount of energy gained per unit charge that passes through a device in the opposite direction to the electric field existing across that device. ...
In mathematics, two quantities are called proportional if they vary in such a way that one of the quantities is a constant multiple of the other, or equivalently if they have a constant ratio. ...
Magnetic flux, represented by the Greek letter Φ (phi), is a measure of quantity of magnetism, taking account of the strength and the extent of a magnetic field. ...
An open surface with X-, Y-, and Z-contours shown. ...
In practice, this means that an electrical current will be induced in any closed circuit when the magnetic flux through a surface bounded by the conductor changes. This applies whether the field itself changes in strength or the conductor is moved through it. In electricity, current is the rate of flow of charges, usually through a metal wire or some other electrical conductor. ...
Electromagnetic induction underlies the operation of generators, induction motors, transformers, and most other electrical machines. “Dynamo†redirects here. ...
Electric motors of various sizes. ...
Figure 1:Three-phase pole-mounted step-down transformer. ...
The article on electrical energy is located elsewhere. ...
Faraday's law of electromagnetic induction states that: Faradays law of induction (more generally, the law of electromagnetic induction) states that the induced emf (electromotive force) in a closed loop equals the negative of the time rate of change of magnetic flux through the loop. ...
 , where  is the electromotive force (emf) in volts- ΦB is the magnetic flux in webers
For the common but special case of a coil of wire, comprised of N loops with the same area, Faraday's law of electromagnetic induction states that Electromotive force (emf) is the amount of energy gained per unit charge that passes through a device in the opposite direction to the electric field existing across that device. ...
Josephson junction array chip developed by NIST as a standard volt. ...
This article is in need of attention. ...
Faradays law of induction (more generally, the law of electromagnetic induction) states that the induced emf (electromotive force) in a closed loop equals the negative of the time rate of change of magnetic flux through the loop. ...
 where - is the electromotive force (emf) in volts
- N is the number of turns of wire (per metre)
- ΦB is the magnetic flux in webers through a single loop.
Further, Lenz's law gives the direction of the induced emf, thus: Electromotive force (emf) is the amount of energy gained per unit charge that passes through a device in the opposite direction to the electric field existing across that device. ...
Josephson junction array chip developed by NIST as a standard volt. ...
This article is in need of attention. ...
Lenzs law (pronounced (IPA) ) gives the direction of the induced electromotive force (emf) and current resulting from electromagnetic induction. ...
- The emf induced in an electric circuit always acts in such a direction that the current it drives around the circuit opposes the change in magnetic flux which produces the emf.
Lenz's law is therefore responsible for the minus sign in the above equation.
Practical Demonstration Two videos demonstrating Faraday's and Lenz's laws can be watched at [http://msdaif.googlepages.com/physics EduMation this law helped us to discover '/.p[km,o
Applications The principles of electromagnetic induction are applied in many devices and systems, including: Induction sealing, otherwise known as cap sealing, is a non-contact method of heating a metallic disk to Hermetically seal the top of plastic and glass containers. ...
Electric motors of various sizes. ...
“Dynamo†redirects here. ...
Figure 1:Three-phase pole-mounted step-down transformer. ...
Rechargeable batteries are batteries that can be restored to full charge by the application of electrical energy. ...
wall, handheld, and floor mount The Magne Charge(tm) Inductive charging system is an Indictive charging used to charge battery electric vehicles (BEV) made by General Motors such as the EV1 and Chevy S10 EV as well as other electric vehicles. ...
The Toyota RAV4 EV was powered by twenty-four 12 volt batteries, with an operational cost equivalent of over 165 miles per gallon at 2005 US gasoline prices. ...
Induction Hob (Top View) An induction cooker uses induction heating for cooking. ...
Induction welding is a form of welding that uses electromagnetic induction to heat the workpiece. ...
An inductor is a passive electrical device employed in electrical circuits for its property of inductance. ...
A pinched aluminium can, produced from a pulsed magnetic field created by rapidly discharging 2 kilojoules from a high voltage capacitor bank into a 3-turn coil of heavy gauge wire. ...
The most common flowmeter, apart from the mechanical flow meters, is the magnetic flow meter. ...
Transcranial magnetic stimulation (TMS) is the use of powerful rapidly changing magnetic fields to induce electric fields in the brain by electromagnetic induction without the need for surgery or external electrodes. ...
The Faraday Flashlight (formerly known as the EverLife Flashlight) is an electronic flashlight heavily marketed via direct marketing campaigns beginning in 2002. ...
A Wacom Graphire2 graphics tablet. ...
It has been suggested that Power beaming be merged into this article or section. ...
See also In electromagnetism, Maxwells equations are a set of equations first presented as a distinct group in the later half of the nineteenth century by James Clerk Maxwell. ...
Faradays law of induction (more generally, the law of electromagnetic induction) states that the induced emf (electromotive force) in a closed loop equals the negative of the time rate of change of magnetic flux through the loop. ...
Inductance (or electric inductance) is a measure of the amount of magnetic flux produced for a given electric current. ...
As the circular plate moves down through a small region of constant magnetic field directed into the page, eddy currents are induced in the plate. ...
Conductor moving in a magnetic field. ...
External links
References - David J. Griffiths (1998). Introduction to Electrodynamics (3rd ed.). Prentice Hall. ISBN 0-13-805326-X.
- Paul Tipler (2004). Physics for Scientists and Engineers: Electricity, Magnetism, Light, and Elementary Modern Physics (5th ed.). W. H. Freeman. ISBN 0-7167-0810-8.
- J.S. Kovacs and P. Signell, Magnetic induction (2001), Project PHYSNET document MISN-0-145.
|
Feeds |
Contact