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Lightning is a proprietary computer bus and power connector, created and designed by Apple Inc. It was introduced on September 12, 2012, in conjunction with the iPhone 5, to replace its predecessor, the 30-pin dock connector. The Lightning connector is used to connect Apple mobile devices like iPhones, iPads, and iPods to host computers ...
A lightning rod or lightning conductor (British English) is a metal rod mounted on a structure and intended to protect the structure from a lightning strike. If lightning hits the structure, it is most likely to strike the rod and be conducted to ground through a wire, rather than passing through the structure, where it could start a fire or ...
Lightning is a natural phenomenon formed by electrostatic discharges through the atmosphere between two electrically charged regions, either both in the atmosphere or one in the atmosphere and one on the ground, temporarily neutralizing these in a near-instantaneous release of an average of between 200 megajoules and 7 gigajoules of energy, depending on the type.
IEC 61000-4-5 is an international standard by the International Electrotechnical Commission on surge immunity. In an electrical installation, disruptive surges can appear on power and data lines. Their sources include abrupt load switching and faults in the power system, as well as induced lightning transients from an indirect lightning strike ...
Alternative definitions. ELF is a subradio frequency. [ 14] Some medical peer reviewed journal articles refer to ELF in the context of "extremely low frequency (ELF) magnetic fields (MF)" with frequencies of 50 Hz [ 15] and 50–80 Hz. [ 16] United States Government agencies, such as NASA, describe ELF as non-ionizing radiation with frequencies ...
The cables are equipped with an ocean ground protection panel to provide isolation and thus hinder damage from lightning. [ 3 ] If it is necessary to pick up the cables, the power feed equipment can send a 4 to 5 hertz sine wave through the high-voltage output, which can be detected on the seabed.
Main distribution frame. Small, single-sided MDF for a military base, 1940s. Modern main distribution frame. In telephony, a main distribution frame ( MDF or main frame) is a signal distribution frame for connecting equipment ( inside plant) to cables and subscriber carrier equipment ( outside plant ).
A lightning strike or lightning bolt is a lightning event in which the electric discharge takes place between the atmosphere and the ground. Most originate in a cumulonimbus cloud and terminate on the ground, called cloud-to-ground (CG) lightning. A less common type of strike, ground-to-cloud (GC) lightning, is upward-propagating lightning ...