# Electromagnetism

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

—————————

## Introduction1

### Dictionary

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. — Merriam-Webster   See also OneLook

### Encyclopedia

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

———————–

———————-

## Innovation

### Science

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

Electricity & Magnetism (Wolfram Alpha)

### Technology

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

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

————————–

## Preservation

### History

History of Electromagnetic Theory (Wikipedia)

—————————

## Participation

### Education

Electrical and Computer Engineering (American Society for Engineering Education)

### Course

Electrical Engineering & Computer Science Courses (MITx)

Electricity and Magnetism Course (MIT OpenCourseWare)

### Occupation

Electricians (CareerOneStop, U.S. Department of Labor, Employment and Training Administration)

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

### Organization

Institute of Electrical and Electronics Engineers (IEEE)

### News

Electrical Engineering (arXiv.org e-Print Archive)

### Document

Electromagnetism (USA.gov)

———————-

## Expression

### Humor

——–
Related

Knowledge Realm

Physical

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

——
Notes

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