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- Ghana (10910 bytes)
1: ...e. Formerly the [[Gold Coast]], the name Ghana is derived from the [[Ghana Empire]] (although its terr...
2: ...ackground: #f9f9f9; border: 1px #aaaaaa solid; border-collapse: collapse; font-size: 95%;"
6: {| border="0" cellpadding="2" cellspacing="0"
10: ...lign="center" width="140px" | ([[Flag of Ghana|In Detail]])
27: | '''[[President of Ghana|President]]''' - Timeline of invention (28171 bytes)
3: ...s ambiguity, the date of the first practical, fielded version of the invention is used here.
60: * [[Odometer]] : [[Ancient Rome|Rome]]: [[Archimedes]]?
66: ...ntury BC|200s BC]]: Compound [[pulley]]: [[Archimedes]]
74: * [[1st century]]: [[Rudder|Stern mounted rudder]] in [[History of China|China]]
83: * [[9th century|800s]]: [[Black powder|Gunpowder]] in [[History of China|China]] - List of inventors (14020 bytes)
11: *[[Archimedes]], (circa 287 BC-212 BC), [[Greece]]
12: *[[Manfred von Ardenne]], (1907-1997), [[Germany]]
14: ...s]],(1927 - June, 1996)of the [[Canada|Canadian]] Department of Agriculture — instant mashed po...
19: *[[Robert Baden Powell]]- scouting movement
22: ... U.S. solar inventor and developer; architectural designer. - Alexander Graham Bell (18688 bytes)
2: subject_name=Alexander Graham Bell |
3: image_name=Alexader_g_bell_1.jpg|
8: dead=dead |
9: date_of_death=[[August 2]] [[1922]] |
10: place_of_death=[[Baddeck, Nova Scotia|Baddeck]], [[Nova Scotia]], [[Canada]] - 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.
13: ...h plate for a given [[potential difference]] or ''voltage'' (''V'') which appears across the plates:
22: ...l to the amount of work required to establish the voltage across the capacitor, and therefore the electri...
26: where V is the voltage across the capacitor. - 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... - Lake (11397 bytes)
1: ... in the northern [[hemisphere]] at higher [[latitude]]s. Large lakes are sometimes referred to as "inl...
3: ...hich is dry most of the time but becomes filled under seasonal conditions of heavy rainfall. Many lake...
6: ...d's lakes are in Canada; this is because of the [[deranged drainage system]] that dominates the countr...
9: ...s. The advance and retreat of glaciers can scrape depressions in the surface where lakes accumulate. S...
11: Lakes can also form by means of landslides or by glacial blockages. An example of the later... - History of chemistry (8174 bytes)
3: ...|thumb|150px|left|Chemistry Clipart .Clipart provided by
6: ==The vitalism debate and organic chemistry==
8: ...], and other synthetic [[dye]]s, as well as the widely used drug [[aspirin]]. The discovery also contr...
12: ...planation of [[Brownian motion]] in the first decade of the [[20th century]].
14: ... the atom as a branch of [[physics]], but was awarded the [[Nobel Prize]] in chemistry, not physics, f... - Solar cell (27643 bytes)
1: ...esearch related to solar cells is known as [[photovoltaics]].
5: ...r_cell.png|thumb|250x|right|A '''solar cell''', made from a poly-crystalline silicon wafer]]
10: ...ta]], after whom the [[volt]] (and consequently [[voltage]]) are named. It means literally ''of light and...
15: ...2662&RS=PN/2402662 US2402662], "''Light sensitive device''"). Sven Ason Berglund had a prior patent co...
19: ... electric power output to the light power input. Ideally, near the equator at noon on a clear day, the...
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