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PostSubject: Ohm and Ohm's law   Ohm and Ohm's law EmptySun Nov 14, 2010 7:07 pm

gucci shoes George Simon Ohm was born in Erlangen, Germany, the city, his father was a locksmith. Father taught himself mathematics and physics knowledge, and teach teens Ohm, Ohm aroused interest in science. The age of 16 he entered the University of Erlangen mathematics, physics and philosophy, because of economic difficulties, the middle school dropout, to complete doctoral studies in 1813. Ohm is a very talented and scientific ambitions, his long-time secondary school teachers, the lack of materials and equipment, to bring a lot of his work difficult, but he was lonely and difficult environment is always persevere in science study, do it yourself equipment.
chanel bags Ohmic current in the wire were studied. He discovered from the Fourier heat conduction law was inspired in the thermal bar is proportional to the heat flow between two temperature difference between these two points. Thus ohms that the current phenomenon Similarly, suppose the current in the wire between two points may be proportional to a driving force among them, that is now known as the EMF. Ohm spent a lot of energy in this respect. He began to stack as photovoltaic power, but because the current instability, the effect is not good. Later he accepted the recommendations of others use thermal batteries for power, thus ensuring the current stability. But how to measure the current size, which was still an unresolved problem.
cheap coach bags Beginning, the thermal effect of ohmic use of current, thermal expansion and contraction of the methods used to measure current, but this method is difficult to get accurate results. He later Oster magnetic effect on the current findings and combined Coulomb torsion balance, current cleverly designed a torsion balance, with a twist of a magnetic needle hanging by a thread, so that power wire and needle are placed parallel to the direction along the meridian; again bismuth and copper with temperature battery, one end of the dip in boiling water, immersed in ice in the other end, and with two slots for the electrodes of mercury, and copper wire connected. When the wire through the current, the needle of the deflection angle is proportional to the current in the wire. The results he published in 1826. 1827 ohms and in the "circuit of Mathematics," a book summary of his experimental laws into the following formula: S = γE. Where S said current; E said electric power, that potential difference across the wire, γ is the conductivity on the current conductor, which is the reciprocal of resistance.
cheap coach bags Ohm's law found early, many physicists can not correctly understand and evaluate this finding, and subjected to skepticism and sharp criticism. Research has been neglected, the economy is extremely difficult to make ohmic depression. Until 1841 the Royal Society awarded him the highest honor of the Copley medal, had provoked the German scientific community attention.
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