EMF
Abbreviation with 2 meanings
| Stands for | Electromagnetic field |
|---|---|
| Meanings | 2 |
| Categories | Science & Engineering |
EMF has two meanings. It stands for Electromagnetic field (physics) or Electromotive force (physics).
Meanings of EMF at a glance
| # | EMF stands for | Context |
|---|---|---|
| 1 | Electromagnetic field | Science & Engineering › Physics |
| 2 | Electromotive force | Science & Engineering › Physics |
1. Electromagnetic field
Science & Engineering · Physics Abbreviations
Physical field produced by electric charges and currents; in health and safety contexts, the low-frequency fields around power lines, wiring and appliances and the radio-frequency fields from phones and transmitters. Exposure limits are set by bodies such as ICNIRP and national regulators.
Example: Residents asked the utility to measure EMF levels near the new high-voltage line.
The International Agency for Research on Cancer classified extremely low-frequency magnetic fields as "possibly carcinogenic" (Group 2B) in 2002 and radio-frequency fields likewise in 2011, reflecting limited evidence rather than proven harm. To tell the two EMF meanings apart, note the units: electromotive force is in volts, while field strength is given in volts per meter or microtesla.
2. Electromotive force
Science & Engineering · Physics Abbreviations
Energy per unit charge supplied by a source such as a battery, generator or solar cell, measured in volts. EMF is the voltage a source produces with no current flowing; under load the terminal voltage is lower because of the source's internal resistance.
Example: A fresh AA alkaline cell has an EMF of about 1.5 V.
Despite the name, electromotive force is not a force but a voltage; the term dates from Alessandro Volta's era. A motor spinning in a magnetic field generates a "back EMF" that opposes the supply and limits its current. Faraday's law states that a changing magnetic flux induces an EMF in a circuit.
Related abbreviations
More physics abbreviations
- CMP – Condensed matter physics
- CMS – Compact Muon Solenoid
- COM – Center of mass
- CP – Charge-parity (symmetry)
- ELF – Extremely low frequency
- EM – Electromagnetic
- EMP – Electromagnetic pulse
- EMR – Electromagnetic radiation
- EPR – Einstein-Podolsky-Rosen (paradox)
- EUV – Extreme ultraviolet
- FBD – Free-body diagram
- FCC – Future Circular Collider