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Other cells for generating electricity by means other than motion of a conductor in
a magnetic field include solar cells, in which electron flow between
semiconductors results from absorption of light, and fuel cells, in which a
continuous supply ...
The most common type of magnetic recorder makes use of a magnetic tape. This
passes at constant speed close to a recording head that may consist of a U-
shaped magnet yoke with coils wound on each limb. As the current in the coil
Convinced of the interrelation of electricity and magnetism, he discovered the
phenomenon of electromagnetic induction — the production of electric current by
a change in magnetic intensity. In 1833 he became professor of chemistry at the ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review
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For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review