Cosma / Communication / Knowledge / Realm / Physical / Force / Electromagnetism

Changing electric fields produce magnetic fields, and changing magnetic fields produce electric fields. Thus the fields can animate one another in turn, giving birth to self-reproducing disturbances that travel at the speed of light.   Ever since Maxwell, we understand that these disturbances are what light is.   —   Frank Wilczek, The Lightness of Being: Mass, Ether, and the Unification of Forces




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   See also OneLook


Roget’s II (Thesaurus.com), Merriam-Webster Thesaurus, Visuwords


Electromagnetism is an 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. Electromagnetic phenomena are defined in terms of the electromagnetic force, sometimes called the Lorentz force, which includes electricity and magnetism as different manifestations of the same phenomenon. — Wikipedia

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



Smarter Every Day (YouTube Channel)




Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by Maxwell’s equations. Various common phenomena are related to electricity, including lightning, static electricity, electric heating, electric discharges and many others. The presence of an electric charge, which can be either positive or negative, produces an electric field. The movement of electric charges is an electric current and produces a magnetic field. — Wikipedia

Magnetism is the class of physical attributes that are mediated by a magnetic field, which refers to the capacity to induce attractive and repulsive phenomenon in other entities. Electric currents and the magnetic moments of elementary particles give rise to a magnetic field, which acts on other currents and magnetic moments. Magnetism is one aspect of the combined phenomenon of electromagnetism. The most familiar effects occur in ferromagnetic materials, which are strongly attracted by magnetic fields and can be magnetized to become permanent magnets, producing magnetic fields themselves. — Wikipedia

Fundamental Forces of Physics (Sci Show, YouTube Playlist)

Minute Physics (YouTube)

Electricity & Magnetism (Wolfram Alpha)


Electronics deals with the emission, behaviour and effects of electrons using electronic devices. Electronics uses active devices to control electron flow by amplification and rectification, which distinguishes it from classical electrical engineering, which only uses passive effects such as resistance, capacitance and inductance to control electric current flow. — Wikipedia

Electricity & Electronics Science Projects (Science Buddies)
Science Buddies (YouTube Channel)

Electrical engineering is concerned with the study, design, and application of equipment, devices, and systems which use electricity, electronics, and electromagnetism. It emerged as an identifiable occupation in the latter half of the 19th century after commercialization of the electric telegraph, the telephone, and electrical power generation, distribution, and use. Electrical engineering is now divided into a wide range of different fields, including computer engineering, systems engineering, power engineering, telecommunications, radio-frequency engineering, signal processing, instrumentation, photovoltaic cells, electronics, and optics and photonics. — Wikipedia

Electrical and Electronics Engineering (Encyclopædia Britannica)
Electrical Engineering (Wolfram Alpha)



Electromagnetism Campaigns (Kickstarter)
Electromagnetism Campaigns (Indiegogo)


Electromagnetism Gifts (Zazzle)




Crash Course: History of Science (YouTube Playlist)

Benjamin Franklin (Encyclopædia Britannica)

Hans Christian Ørsted (Encyclopædia Britannica)
oersted (Encyclopædia Britannica)

Crash Course Physics (YouTube Playlist)

André-Marie Ampère (Encyclopædia Britannica)
Ampère’s law (Encyclopædia Britannica)

Georg Ohm (Encyclopædia Britannica)
ohm (Encyclopædia Britannica)

Michael Faraday (Encyclopædia Britannica)

Objectivity (Royal Society, YouTube Channel)
Objectivity (Royal Society)

Hendrik Antoon Lorentz (Encyclopædia Britannica)
Lorentz transformations (Encyclopædia Britannica)

James Clerk Maxwell (Encyclopædia Britannica)
Maxwell’s Equations (Encyclopædia Britannica)

Computing and Electronics History (Engineering and Technology History Wiki)
IEEE Milestones Timeline (Engineering and Technology History Wiki)

History of Electromagnetic Theory (Wikipedia)


Library of Congress # QC501 Electricity (UPenn Online Books)
Library of Congress # Electrical Engineering, Electronics (UPenn Online Books)

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




Electromagnetism (Physics4Kids)
Electricity, Magnets & Circuits (PHET Interactive Simulations, University of Colorado)

Electrical and Computer Engineering (American Society for Engineering Education)

MERLOT: Multimedia Educational Resource for Learning and Online Teaching
OER Commons: Open Educational Resources


Crash Course Physics (YouTube Playlist)

Circuits and Electronics 1: Basic Circuit Analysis (MITx)
Circuits and Electronics 2: Amplification, Speed, and Delay (MITx)
Circuits and Electronics 3: Applications (MITx)

Electronic Materials and Devices (MITx)
Magnetic Materials and Devices (MITx)

Electrical Engineering & Computer Science Courses (MITx)

Electricity and Magnetism Course (MIT OpenCourseWare)

Electromagnetism Courses (MIT OpenCourseWare)
Electricity Courses (MIT OpenCourseWare)
Electronics Courses (MIT OpenCourseWare)
Electrical Engineering Courses (MIT OpenCourseWare)



Electrical Engineers (CareerOneStop, U.S. Department of Labor, Employment and Training Administration)
Electrical Engineer (Career Cornerstone)


Institute of Electrical and Electronics Engineers (IEEE)


IEEE Spectrum
Electrical and Electronic Engineering

Electrochemistry (Nature)
Electricity (Science Daily)
Electromagnetism (NPR Archives)


Electromagnetism (ISBNdb)



Electromagnetism (USA.gov)




Electricity (Tim Hunkin, The Rudiments of Wisdom Encyclopedia)
Magnetism (Tim Hunkin, The Rudiments of Wisdom Encyclopedia)
Lightning (Tim Hunkin, The Rudiments of Wisdom Encyclopedia)


Snap Circuits Kits (Elenco)

SparkFun Electronics (YouTube Channel)
SparkFun Electronics (Official Site)
SparkFun Electronics (Wikipedia)

Toy Construction Kits (Cosma)


The Rise, Fall, and Rise of Electronics Kits (Robert W. Lucky, IEEE Spectrum)



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.