Definition
“Ohms law states that the current passing through a
conductor is directly proportional to the potential difference applied across
its end provided the temperature and the physical state of a conductor remains
the same”.
Formulas
V=IR
I=V/R R=V/I
Here I is the current of the conductor, V are the voltage
across the conductor and R is the resistance of the conductor. Ohms law states
that R is a constant. By using ohms law we can also measure the current and resistance of the conductor. Which are as above:
History of Ohms Law
This law was published in 1827. The German Scientist George
Ohm discovers this law and he described the voltage measurements, current
measurements with different lengths of conductor.
Microscopic Analysis
Ohms law is an empirical law. It is generalized by many experiments.
Basically ohms law is based on Drude model which is developed by Paul drude. The
drude model reacts like pin balls bouncing among the ions that makes the
structure of the material.
Electrons are accelerated in opposite direction to the
electric field. In collision the electron deflects in a random direction with a
velocity which is larger than the velocity of electric field. The result is
that the electrons take a zigzag path due to collision.
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