Hall effect and 1879: Difference between pages
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[[Centuries]]: [[Year in Review 19th Century]] ([[18th century]] - '''[[19th century]]''' - [[20th century]]) |
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The '''Hall Effect''' (discovered by Dr. Edwin Hall in 1879) states that when a [[magnetic field]] is applied perpendicular to a thin sheet of conducting or semiconducting material through which current is flowing (the Hall element), a potential ([[voltage]]) difference will be created on opposite edges of the hall element. By measuring the Hall voltage across the sensing element, one can determine the strength of the magnetic field applied [[perpendicular]] to the Hall element. Hall Effect Sensors are readily available from a number of different manufacturers. The most common types are [[Analog]] Hall Effect Sensors (which output a voltage that is proportional to the applied magnetic field) and [[Digital]] Hall Effect Sensors (which are often used as magnetically controlled [[switch|switches]] -- they turn on or off when the applied magnetic field reaches a certain level). |
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[[Decades]]: [[1820s]] [[1830s]] [[1840s]] [[1850s]] [[1860s]] - '''[[1870s]]''' - [[1880s]] [[1890s]] [[1900s]] [[1910s]] [[1920s]] |
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One important feature of tha Hall effect is that it differentiates between positive charges moving in one direction versus negative charges moving in the opposite. The hall effect offered the first real proof that electric currents in metals are carried by moving electrons, and not protons. Interestingly enough, the Hall effect also showed that in some substances (especially [[semiconductors]]), it is more appropriate to think of the current as positive "holes" moving rather than negative electrons. |
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Years: [[1874]] [[1875]] [[1876]] [[1877]] [[1878]] - '''1879''' - [[1880]] [[1881]] [[1882]] [[1883]] [[1884]] |
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'''Events''' |
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'''Births''' |
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*[[March 14]]: [[Albert Einstein]], scientist. |
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*[[Joseph Stalin]], Soviet leader |
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*[[Leon Trotsky]], Russian revolutionary |
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'''Deaths''' |
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*[[February 11]]: [[Honore Daumier]], caricaturist/painter. |
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*[[February 11]]: [[Willem J van Zeggelen]], Dutch author. |
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Revision as of 00:10, 27 January 2002
Centuries: Year in Review 19th Century (18th century - 19th century - 20th century)
Decades: 1820s 1830s 1840s 1850s 1860s - 1870s - 1880s 1890s 1900s 1910s 1920s
Years: 1874 1875 1876 1877 1878 - 1879 - 1880 1881 1882 1883 1884
Events
Births
- March 14: Albert Einstein, scientist.
- Joseph Stalin, Soviet leader
- Leon Trotsky, Russian revolutionary
Deaths
- February 11: Honore Daumier, caricaturist/painter.
- February 11: Willem J van Zeggelen, Dutch author.