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  1. Morse code (33777 bytes)
    1: ...b|right|Portrait of Samuel F. B. Morse.Image provided by [http://classroomclipart.com Classroom Clip A...
    2: ...orse code is the only digital [[modulation]] mode designed to be easily read by humans without a compu...
    4: ...rly form of a digital code. International Morse code is composed of six elements:
    11: ...by more regular formats, including the [[Baudot code]] and [[ASCII]].
    13: ...s, became known as Railroad or [[American Morse code]], and is now very rarely used.
  2. Lightning (33113 bytes)
    2: ...ning strokes are observed during a night-time thunderstorm.]]
    6: ...e air, producing lightning's characteristic [[thunder]] sound.
    10: ...but while waiting for its completion, he got the idea of using a flying object, such as a [[kite]] ins...
    12: ...fallen during the storm had soaked the line and made it conductive.
    14: ...ted the original high-object-with-some-spark-gap idea that they used, so he usually gets the credit.
  3. Capacitor (29664 bytes)
    2: ...ade of metal) stacked or rolled to form a compact device, but '''every''' multi-[[conductor]] [[geomet...
    7: ... but opposite charge, the ''total'' charge in the device is always zero.
    22: ...cumulates on the plates of a capacitor, a voltage develops across the capacitor due to the electric fi...
    30: For an ideal capacitor, the capacitor [[current]] is proport...
    45: ...rs are usually specified such as 5 or 10%, or broader ranges for some types. Adjustable versions have ...
  4. Electricity (13894 bytes)
    1: ...s law]]. Some electrical effects are discussed under [[electrical phenomenon]] and [[electromagnetism...
    8: ...ian]] walls, such as the [[Dendera light]]. Other devices discovered in Egyptian and other archaeologi...
    10: ...tist)|William Watson]], experimenting with the Leyden jar, discovered in [[1747]] that a discharge of ...
    11: ...:Electricity clipart.jpg|thumb|250px|Clipart provided by [http://classroomclipart.com Classroom Clip A...
    12: ... frequently) or [[Ebenezer Kinnersley]] of [[Philadelphia]] (less frequently) who created the conventi...
  5. Magnet (13875 bytes)
    4: ...n stone". [[Magnesia]] is an area in Greece where deposits of [[magnetite]] have been discovered since...
    6: ...magnet]]. Permanent magnets do not rely upon outside influences to generate their field. Electromagnet...
    14: ...tween'' atoms and molecules. Without long range ordering, there is no net magnetic field because the m...
    16: ... great deal of order. The greater the degree of ordering within and between domains, the greater the r...
    18: Long range ordering (and the resulting strong net magnetic field)...
  6. Leyden jar (3953 bytes)
    1: [[image:Leydenjar.png|thumb|right|111px|Original [[capacitor]]]...
    3: ... '''Leyden jar''' was the original [[capacitor]], developed in the [[18th century]] and used to conduc...
    5: ==Description==
    7: ...etal ball. Typical designs consist of an [[electrode]] and a plate, each of which stores an opposite c...
    10: ...humb|left|222px|Leyden jars, Museum Boerhaave, Leiden [http://www.museumboerhaave.nl/]]]

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