Ohm's Law

Georg Simon Ohm was a German physicist born in Erlangen, Bavaria, on March 16, 1787. Using the results of his experiments, Georg Simon Ohm was able to describe the basic relationship between voltage, current, and resistance. These basic relationships are of such great significance, that they stand for the true beginning of electrical circuit analysis. And it is very big invention in electronics field.

Using apparatus of his own construction, Ohm determined that the current that flows through a wire is proportional to its cross sectional area and inversely proportional to its length or Ohm’s law.

In other words ohm’s law can be state as below:

Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points, and inversely proportional to the resistance between them.
The mathematical equation that describes this relationship is:


                                       I = V/R

Where I is the current through the conductor in units of amperes, V is the potential difference measured across the conductor in units of volts, and R is the resistance of the conductor in units of ohms. More specifically, Ohm's law states that the R in this relation is constant, independent of the current.