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Megger- A Guide to Low Resistance Testing

From Omni Controls, Inc.
 

 
The quantitative study of electrical circuits originated in 1827, when Georg Simon Ohm published his famous book "Die galvanische Kette, mathematisch bearbeitet" in which he gave his complete theory of electricity. In this seminal work, he introduced the relationship or "Law" that carries his name: Resistance (R) = Voltage (E) / Current (I) At that time, the standards for Voltage, Current and Resistance had not been developed. Ohm's Law expressed the fact that the magnitude of the current flowing in a circuit depended directly on the electrical forces or pressure and inversely on a property of the circuit known as the resistance. Obviously, however, he did not have units of the size of our present volt, ampere, and ohm to measure these quantities. At this time, laboratories developed resistance elements, constructed of iron, copper or other available alloy materials. The laboratories needed stable alloys that could be moved from place to place to certify the measurements under review.
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