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electromagnetism : a fundamental physical force that is responsible for interactions between charged particles which occur because of their charge and for the emission and absorption of photons, that is about a hundredth the strength of the strong force, and that extends over infinite distances but is dominant over atomic and molecular distances — called also electromagnetic force. — Webster

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Electromagnetism is a branch of physics involving the study of the electromagnetic force, a type of physical interaction that occurs between electrically charged particles. The electromagnetic force usually exhibits electromagnetic fields such as electric fields, magnetic fields and light, and is one of the four fundamental interactions (commonly called forces) in nature. The other three fundamental interactions are the strong interaction, the weak interaction and gravitation. Electromagnetic phenomena are defined in terms of the electromagnetic force, sometimes called the Lorentz force, which includes both electricity and magnetism as different manifestations of the same phenomenon.

The electromagnetic force plays a major role in determining the internal properties of most objects encountered in daily life. Ordinary matter takes its form as a result of intermolecular forces between individual atoms and molecules in matter, and is a manifestation of the electromagnetic force. Electrons are bound by the electromagnetic force to atomic nuclei, and their orbital shapes and their influence on nearby atoms with their electrons is described by quantum mechanics. The electromagnetic force governs all chemical processes, which arise from interactions between the electrons of neighboring atoms. — Wikipedia

Electromagnetism (Eric Weisstein’s World of Physics, Wolfram Research)
Encyclopædia Britannica


Electromagnetism Portal (Wikipedia)


Electricity & Magnetism (Wolfram Alpha)



Electronics (Innovations Report)


CODATA Internationally recommended values of the Fundamental Physical Constants, Electromagnetic (NIST Reference on Constants, Units and Uncertainty)


How Electricity Works (HowStuffWorks)
Electric Power Science Tracer Bullet (Library of Congress)
Electrical Engineering Subject Guide (University of Virginia Libraries)
Electrical Engineering (Wolfram Alpha)




The Kite Experiment (Wikipedia)

Lighting A Revolution: Joseph W. Swan (Smithsonian National Museum of American History)
Thomas Edison, Joseph Swan and The Real Deal Behind the Light Bulb (CIO)


WorldCat, Library of Congress, UPenn Online Books, Open Library




Explore the Electromagnetic Spectrum (Space Place, NASA)
Electricity and Magnetism (Fact Monster)


Electricity and Magnetism (MIT OCW Physics)
OER Commons: Open Educational Resources


Electromagnetism (Phys.org), NPR Archives










Snap Circuits Kits (Elenco)


More News …

Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

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Here are links to pages about closely related subjects.

Knowledge Realm


Law (Constant) Relativity
Force Gravity, Electromagnetism (Light, Color)
Matter (Microscope) Molecule, Atom (Periodic Table), Particle

Universe (Astronomical Instrument)
Galaxy Milky Way, Andromeda
Planetary System Star, Brown Dwarf, Planet, Moon

Our Neighborhood
Solar System Sun
Terrestrial Planet Mercury, Venus, Earth (Moon), Mars
Asteroid Belt Ceres, Vesta
Jovian Planet Jupiter, Saturn, Uranus, Neptune
Trans-Neptunian Object
Kuiper Belt Pluto, Haumea, Makemake
Scattered Disc Eris, Sedna, Planet X
Oort Cloud Etc. Scholz’s Star
Small Body Comet, Centaur, Asteroid


1.   The resources on this page are are organized by a classification scheme developed exclusively for Cosma.