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Electromagnetic clutch
An electromagnetic clutch is a clutch that transmits or interrupts torque between shafts on the same axis through electromagnetic operation, controlled electrically without mechanical linkages, as in automotive air-conditioning compressors.
Electromagnetic coil
An electromagnetic coil, also called a magnetic coil, is insulated wire wound into loops so current produces a concentrated magnetic field or an induced voltage.
Electromagnetic compaction of metal powders
Electromagnetic compaction of metal powders, best known as magnetic pulse compaction (MPC), is a powder metallurgy technique that compresses metal powder to near full density in under a millisecond.
Electromagnetic compatibility
Electromagnetic compatibility (EMC) is the ability of equipment to function in its electromagnetic environment without disturbing other equipment, studied as both an equipment characteristic and an engineering discipline.
Electromagnetic field
An electromagnetic field, or EM field, is a physical field combining an electric and a magnetic field, exerting the Lorentz force on electric charges and described by Maxwell's equations.
Electromagnetic flowmeter
An electromagnetic flowmeter, also called a magnetic flowmeter or magmeter, measures the flow of conductive liquids, causing no pressure loss because it adds no obstruction to the pipe.
Electromagnetic follow-up of gravitational-wave events
Electromagnetic follow-up of gravitational-wave events is the search with optical, radio, X-ray, and other telescopes for light from gravitational-wave sources, most successfully for GW170817 in 2017.
Electromagnetic forming
Electromagnetic forming (EMF) is a high-speed metal forming process that shapes conductive sheet or tube workpieces with pulsed magnetic forces and no tool contact, used most often to join tubes.
Electromagnetic four-potential
The electromagnetic four-potential is a four-vector combining the electric scalar potential and magnetic vector potential, the natural variable of covariant electrodynamics, with gauge freedom leaving the fields unchanged.
Electromagnetic hypersensitivity
Electromagnetic hypersensitivity (EHS), formally idiopathic environmental intolerance attributed to EMF (IEI-EMF), is a self-reported condition attributing non-specific symptoms to electromagnetic fields; blinded provocation studies find no causal link.
Electromagnetic induction
Electromagnetic induction, also called magnetic induction, is the production of a voltage in a conductor when magnetic flux through it changes; Michael Faraday discovered the effect in 1831.
Electromagnetic interference
Electromagnetic interference (EMI), also known as radio frequency interference, is the degradation of equipment or system performance caused by an electromagnetic disturbance such as lightning.
Electromagnetic invariants
Electromagnetic invariants are scalar combinations of the electric and magnetic fields, B² − E² and E·B, that take the same value in every inertial frame.
Electromagnetic mass
Electromagnetic mass is the mass attributed to the energy of a charged particle's own electric and magnetic field, an idea introduced by J.J. Thomson in 1881.
Electromagnetic Phenomena
Electromagnetic phenomena (MeSH D055590): electricity, magnetism, charged particles, fields, and electromagnetic radiation. Covers Maxwell's theory, the spectrum from radio to gamma rays, and medical uses.
Electromagnetic pulse
An electromagnetic pulse (EMP) is an intense, short burst of electromagnetic radiation that can disrupt or damage electronics, produced by nuclear detonations, non-nuclear devices, or solar storms.
Electromagnetic pump
An electromagnetic pump is a pump that moves electrically conducting liquids, usually liquid metals, using Lorentz forces instead of a mechanical impeller, so no moving parts touch the fluid.
Electromagnetic radiation
Electromagnetic radiation, also called EM radiation or EM waves, is energy carried through space by oscillating electric and magnetic fields at light speed, ranging from radio waves to gamma rays.
Electromagnetic radiation and health
Electromagnetic radiation and health: how ionizing radiation (X-rays, gamma) and non-ionizing radiation (radiofrequency, power fields) affect the body, dose thresholds, cancer evidence, IARC Group 2B, and ICNIRP exposure limits.
Electromagnetic scalar and vector potentials
The electromagnetic scalar and vector potentials are auxiliary fields from which the electric and magnetic fields are computed; gauge freedom means many potential pairs give the same fields.
Electromagnetic shielding
Electromagnetic shielding, also known as RF shielding, blocks electromagnetic fields using conductive or magnetic materials so interference neither enters nor leaves protected electronics, a key method for achieving electromagnetic compatibility.
Electromagnetic spectrum
The electromagnetic spectrum is the entire range of electromagnetic radiation arranged by frequency or wavelength, from radio waves through visible light to gamma rays, with no sharp boundaries between bands.
Electromagnetic stress–energy tensor
The electromagnetic stress–energy tensor describes the density and flux of energy and momentum carried by an electromagnetic field, and serves as a source term in Einstein's field equations.
Electromagnetic suspension
Electromagnetic suspension (EMS) is a maglev method in which vehicle electromagnets attract it upward toward a ferromagnetic track, holding a small actively controlled gap at all speeds.
Electromagnetic tensor
The electromagnetic tensor, also called the Faraday tensor or field strength tensor, combines electric and magnetic fields into one object that transforms correctly between inertial frames in special relativity.
Electromagnetic tomography
Electromagnetic tomography is a geophysical method that reconstructs subsurface electrical conductivity from electromagnetic field measurements made at the surface, in boreholes, or from the air.
Electromagnetic transient simulation
Electromagnetic transient (EMT) simulation is a time-domain numerical method computing instantaneous power network voltages and currents during fast disturbances like switching, faults, and lightning, introduced by Hermann Dommel in 1969.
Electromagnetic warfare
Electromagnetic warfare (EW), formerly electronic warfare, is military action exploiting the electromagnetic spectrum for situational awareness and offensive and defensive effects: jamming, protection, and support across air, land, sea, space, and cyber domains.
Electromagnetic wave equation
The electromagnetic wave equation is the second-order partial differential equation, derived from Maxwell's equations, that governs how electric and magnetic fields propagate as waves at the speed of light.
Electromagnetically induced transparency
Electromagnetically induced transparency (EIT) is a quantum interference effect in which a coupling laser makes an absorbing medium transparent, dramatically slowing light for storage and sensing.