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- Morse code (33777 bytes)
1: [[Image:Morse_sam.jpg|250px|thumb|right|Portrait of Samuel F. B. Morse.Image provided by [http://c...
2: ...r, making it appropriate for sending automated digital data in voice channels.
4: ...s — on and off — it was an early form of a digital code. International Morse code is composed of s...
5: # short mark, dot or 'dit' (·)
7: ...intra-character gap (between the dots and dashes within a character) - Lightning (33113 bytes)
6: ...mpanied by the emission of [[light]]. The electricity passing through the discharge channels rapidly h...
10: ...t the idea of using a flying object, such as a [[kite]] instead.
12: ...len during the storm had soaked the line and made it conductive.
14: ...p idea that they used, so he usually gets the credit.
16: ...e of the room split, and the door itself torn off its hinges. - Capacitor (29664 bytes)
2: ...y''' multi-[[conductor]] [[geometry]] has '''capacitance'''.
4: == Physics of the capacitor ==
7: ...ric. Because each plate stores an equal but opposite charge, the ''total'' charge in the device is al...
9: ...l capacitor, the dielectric is in direct contact with the plates.)]]
11: === Capacitance === - Electricity (13894 bytes)
1: ...ite-charged objects attract one another. The magnitude of the force of attraction or repulsion is giv...
3: ...ge. For example, "''Q'' = 0.5 C" means "the quantity of electric charge is 0.5 coulomb."
6: ... to jump. This is the origin of the word "electricity", from the [[Greek language|Greek]] ''ēlekt...
8: ...l digs have been alleged to be [[battery (electricity)|electrical batteries]].
10: ...ed in [[1747]] that a discharge of static electricity was equivalent to an [[electric current]]. - Magnet (13875 bytes)
4: ...of [[magnetite]] have been discovered since antiquity.
6: ...et is any material that has a [[magnetic field]]. It can be in the form of a permanent magnet or an [[...
12: ... matter contains huge numbers of these particles, it would be expected that all matter would be magnet...
14: ... of these spins ''between'' atoms and molecules. Without long range ordering, there is no net magnetic...
16: ...eal of order. The greater the degree of ordering within and between domains, the greater the resulting... - Leyden jar (3953 bytes)
1: ...e:Leydenjar.png|thumb|right|111px|Original [[capacitor]]]]
3: ...ed to conduct many early experiments in [[electricity]].
7: ... at the surface of the elements, at the boundary with the dielectric.
14: ...d after [[Leiden]], the home town of the [[university]].
16: ...ncluded, for example, to apply [[Kirchhoff's circuit laws#Kirchhoff's current law|Kirchhoff's current ...
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