The ohm is a unit of measurement for resistance in the International System of Measurements, represented by the Greek letter omega. Georg Ohm was a German physicist who published a groundbreaking work on electricity in 1919, but it took him many years to gain recognition for his work. Ohm’s law is written as V/I = R, where V is voltage, I is current, and R is resistance. The reverse measure is called siemens or mho, expressed as an inverted omega or an ohm to the first negative power.
An ohm is a unit used in the International System of Measurements for measuring resistance, represented by the Greek letter omega (Ω). By definition, it is equal to one volt creating one ampere in a device, abbreviated as V/A. An ampere, or amp, is a measure of current equal to a specific amount of force between a theoretical pair of infinite conductors in a vacuum.
Georg Ohm was a German physicist in the early 19th century. He was well trained in both mathematics and physics and held a number of distinguished teaching positions. In 1919 he published what is regarded by most as his major work, Die galvanische Kette mathematisch bearbeitet, in which he expounded most of his general theory of electricity.
Ohm is considered by many to be one of the great fathers of electricity, as his work heavily influenced all theory of the time. Ironically, it took him many years to gain recognition in the same life as him. Although he fought for a professorship at a university, he received little recognition for his groundbreaking work until the end of his life. Much of this was no doubt due to his reliance on mathematics as a basic way of describing his theories on how electricity worked. While much cleaner and ultimately more useful than the non-mathematical physics of the time, it was hard for much of the establishment to accept.
The equation that gives the measure that bears his name, Ohm’s law, is quite simple. It is written as V/I = R, where V is the voltage of a device, I is the current, and R is the resultant resistance. It should be noted that the resistance of a real-world device is never exactly true to this law, as impurities in the conductor and the actual behavior of the electrons affect the resistance. In practice, however, such discrepancies are negligible enough to ignore, and this law can be assumed to be true.
There is also a reverse measure, alternately called siemens or mho. It can be expressed as an inverted omega or an ohm to the first negative power. One mho can be defined as A/V, where A is ampere and V is voltage.
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