Tech moves fast! Stay ahead of the curve with Techopedia!
Join nearly 200,000 subscribers who receive actionable tech insights from Techopedia.
An electromagnetic field (EMF) is an electricity derivative produced by electrical conductors and alternating currents. EMFs surround electronic devices when there is a change in charged particle velocity. Electrical currents are generated and ignite magnetic fields that are produced when charged electrons gain speed. It is measured in Hertz.
EMF has facilitated fast and convenient communication and advanced the use of wireless devices, such as smartphones, mobile devices and laptops.
In the late 19th century, the first EMF was discovered by physicists experimenting with electric arcs (or sparks) produced from a distance. The electric spark discovery evolved into wireless communication and the first radio transmitters of the 20th century.
Electromagnetic energy exists between the electromagnetic range of waves between FM radio and satellite stations. These EMF frequencies help power electronic devices. For example, when making a cell phone call, the phone's signal is transmitted from the phone's antenna to the antenna of the corresponding base station. The base station then gives the cell phone or related device a radio frequency channel, which receives and transmits communication. In terms of cell phones, this process occurs after the base station moves the call to a switching center or the user's cell phone carrier.
Wireless handheld technology sales and usage have catapulted over the last decade, although health concerns have been raised about the potential long-term effects of wireless technology. However, cell phones have been found to not exude the most harmful wireless technology component, which is ionizing radiation.