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- Morse code (33777 bytes)
2: ...ver, with the development of more advanced communications technologies, the use of Morse code is now l...
4: ...nical or visual signal (e.g. a flashing light). Because Morse code is transmitted using just two state...
11: ...racters made it hard to adapt to automated communication, so it was largely replaced by more regular f...
13: ...United States, became known as Railroad or [[American Morse code]], and is now very rarely used.
17: ...n in 1844, marked a paper tape — when an electrical current was transmitted, the receiver's electrom... - Lightning (33113 bytes)
10: ...truments, a number of people proposed that small scale sparks shared some similarity with lightning. [...
16: ...ard [[thunder]]. He ran home with his engraver to capture the event for posterity. While the experimen...
18: ...lin also invented the [[lightning rod]], likely because of the results of his experiment.
22: ...ually fail to produce enough charge separation to cause lightning.
24: ...lament grows in length. At the same time, electrical energy stored in the e-field flows radially inwa... - Capacitor (29664 bytes)
2: ...'every''' multi-[[conductor]] [[geometry]] has '''capacitance'''.
4: == Physics of the capacitor ==
7: ...e plates, at the boundary with the dielectric. Because each plate stores an equal but opposite charge...
9: ...es. (The air gap is shown for clarity; in a real capacitor, the dielectric is in direct contact with ...
11: === Capacitance === - Electricity (13894 bytes)
1: ...e electrical effects are discussed under [[electrical phenomenon]] and [[electromagnetism]].
6: ...ge|Greek]] ''ēlektron'' = "[[amber]]", which came from an old [[root (linguistics)|root]] ''ē...
8: ...been alleged to be [[battery (electricity)|electrical batteries]].
10: ...[Leyden jar]], a type of [[capacitor]] for electrical energy in large quantities, was invented at [[Le...
16: ...d by society, in that fundamental units of electrical measurement are named after them. - Magnet (13875 bytes)
6: ...is any material that has a [[magnetic field]]. It can be in the form of a permanent magnet or an [[ele...
8: ==Physical origin of magnetism==
12: ...c. Everyday experience shows that this is not the case.
14: ...e magnetic moment of each one of the particles is canceled by the magnetic moment of other particles.
16: ...exists within [[magnetic domain]]s. These domains can be likened to microscopic neighborhoods in which... - Leyden jar (3953 bytes)
1: ...[image:Leydenjar.png|thumb|right|111px|Original [[capacitor]]]]
3: The '''Leyden jar''' was the original [[capacitor]], developed in the [[18th century]] and u...
7: ...ed through the lid and ended in a metal ball. Typical designs consist of an [[electrode]] and a plate,...
12: ...rks. This is the [[triboelectric effect]], mechanical separation of charge in a dielectric. Their wor...
14: ...invention went on to be known as the Leyden jar because in 1746, [[Pieter van Musschenbroek]] of the [...
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