See also:born at
See also:Erlangen on the 16th of
See also:March 1787, and was educated at the university there . He became
See also:professor of
See also:mathematics in the
See also:college at Cologne in 1817 and in the polytechnic school of
See also:Nuremberg in 1833, and in 1852 professor of experimental physics in the university of
See also:Munich, where he died on the 7th of
See also:July 1854 . His writings were numerous, but, with one important exception, not of the first
See also:order . The exception is his pamphlet published in Berlin in 1827, with the title .Die galvanische Kette mathematisth bearbeitet . This
See also:work, the germs of which had appeared during the two preceding years in the
See also:journals of Schweigger and Poggendorff, has exerted most important influence on the whole development of the theory and applications of current
See also:electricity, and
See also:Ohm's name has been incorporated in the terminology of electrical science . Nowadays " Ohm's
See also:Law," as it is called, in which all that is most valuable in the pamphlet is summarized, is as universally known as anything in physics . The equation for the
See also:propagation. of electricity formed on Ohm's printiples is identical with that of J . B . J .
See also:Fourier for the propagation of
See also:heat; and if, in Fourier's solution of any problem of heat-
See also:conduction, we
See also:change the word " temperature " to " potential " and write " electric current " instead of "
See also:flux of heat," we have the solution of a corresponding problem of electric conduction . The basis of Fourier's work was his clear conception and definition of conductivity . But this involves an
See also:assumption, 'undoubtedly true for small temperature-gradients, but still an assumption, viz. that, all else being the same, the flux of heat is strictly proportional to the gradient of temperature .
An exactly similar assumption is made in the statement of Ohm's law, i.e. that, other things being alike, the strength of the current is at each point proportional to the gradient of potential . It happens, how-ever, that with our
See also:modern methods it is much more easy to test the accuracy of the assumption in the case of electricity than in that of heat; and it has accordingly been shown by J . Clerk Maxwell and
See also:George Chrystal that Ohm's law is true, within the limits of experimental error, even when the currents are so powerful as almost to fuse the conducting
See also:wire .
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