Ohm's Law

Ohm's Law
Ohm's law is a statement that the electric current flowing through a conductor is always proportional to the potential difference is applied to him. [1] [2] A conductive object is said to obey Ohm's law if the resistance value is not dependent on the polarity of the potential difference and imposed him. [1] Although the statement does not necessarily apply to all types of conductors, however, the term "law" continued to be used for reasons of history. [1]

Ohm's law is expressed mathematically by the equation: [3] [4]

     V = I R \

where:

     I is the electric current flowing in a conductor in units of amperes.
     V is the voltage present at both ends of the conductor in units of volts.
     R is the value of electrical resistance (resistance) contained in a conductor in units of ohms.

This law was initiated by George Simon Ohm, a German physicist in 1825 and published in a paper entitled The Galvanic Circuit Investigated Mathematically in 1827. [5]