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Message: <blockquote data-quote="Little DJ" data-source="post: 10824187" data-attributes="member: 320663">අයන්නේ සිට ඉලෙකට්‍රොනික්ස්.....                                                 Georg Simon Ohm<a href="http://3.bp.blogspot.com/-v5RXe0uMpBU/TktTKhaRhlI/AAAAAAAAAEU/wqihFj7VsqQ/s1600/kkkkkkkkk.JPG" target="_blank"><img src="http://3.bp.blogspot.com/-v5RXe0uMpBU/TktTKhaRhlI/AAAAAAAAAEU/wqihFj7VsqQ/s200/kkkkkkkkk.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a> Georg  Simon Ohm was born in Erlangen, Bavaria, on March 16, 1787. His father  was a master mechanic who determined that his son should obtain an  education in science. Although Ohm became a teacher in a high school, he  had aspirations to receive a university appointment. The only way that  such an appointment could be realized would be if Ohm could produce  important results through scientific research. Since the science of  electricity was in its infancy, and because the electric cell had  recently been invented by the Italian Conte Alessandro Volta, Ohm  decided to study the behavior of current in resistive circuits. Because  equipment was expensive and hard to come by, Ohm made much of his own,  thanks, in large part, to his father’s training. Using this  equipment, Ohm determined experimentally that the amount of current  transmitted along a wire was directly proportional to its  cross-sectional area and inversely proportional to its length. From  these results, Ohm was able to define resistance and show that there was  a simple relationship between voltage, resistance, and current. This  result, now known as Ohm’s law, is probably the most  fundamental relationship in circuit theory. However, when published in  1827, Ohm’s results were met with ridicule. As a result, not only did  Ohm miss out on a university appointment, he was forced to resign from  his high-school teaching position. While Ohm was living in poverty and  shame, his work became known and appreciated outside Germany. In 1842,  Ohm was appointed a member of the Royal Society. Finally, in 1849, he  was appointed as a professor at the University of Munich, where he was  at last recognized for his important contributions.                                            Ohm's Law<a href="http://2.bp.blogspot.com/-_BZjYYDkwMM/TktUJNfFhcI/AAAAAAAAAEY/XdD0BY5w_g8/s1600/gggg.JPG" target="_blank"><img src="http://2.bp.blogspot.com/-_BZjYYDkwMM/TktUJNfFhcI/AAAAAAAAAEY/XdD0BY5w_g8/s400/gggg.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a> Ohm  determined experimentally that current in a resistive circuit is  directly proportional to its applied voltage and inversely proportional  to its resistance.I = V / R                                                                                     V                                                                                   is the voltage in volt                                                                                    R is the resistance in ohm                                                                                    I is the current in ampereIts determine that  that larger the applied voltage, larger the current, while larger the resistance, smaller the current. Examples:<a href="http://4.bp.blogspot.com/-5qndQTQ3jS8/TktWLCDx87I/AAAAAAAAAEc/Y1asLB8_YTE/s1600/fffff.JPG" target="_blank"><img src="http://4.bp.blogspot.com/-5qndQTQ3jS8/TktWLCDx87I/AAAAAAAAAEc/Y1asLB8_YTE/s400/fffff.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a> For  an isolated resistive element, the polarity of the voltage drop is as  shown in following figure (a) for the indicated current direction. A  reversal in current will reverse the polarity as in figure (b). In  general, the flow of charge is from a high (+) to a low (-) potential.  Polarities as established by current direction will become increasingly  important in the circuit analysis.<a href="http://3.bp.blogspot.com/-UQ9PooTmdfg/TktXeKf4bDI/AAAAAAAAAEg/c900cG5glZs/s1600/fffffffffffffffffffff.JPG" target="_blank"><img src="http://3.bp.blogspot.com/-UQ9PooTmdfg/TktXeKf4bDI/AAAAAAAAAEg/c900cG5glZs/s320/fffffffffffffffffffff.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>For More Details: <a href="http://www.electronicworkspace.com/" target="_blank">Click Here</a></blockquote>

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