OHM'S LAW

OHM's LAW:    

 The relationship between voltage (V), Current(I), and resistance (R) in a DC circuit was first discovered by scientist George Simon Ohm. This relationship is called Ohm's law

Ohm's Law States that,

The current flowing through a conductor is directly proportional to the potential difference across the ends of the conductor, provided the temperature do not change.                         V∝ I                         Voltage            V = I x R                                  Current            I  = V  ÷ R                             Resistance       R = V ÷ I

The video below will help you to understand Ohm's law  with clarity

Below cartoon  depicts relation between voltage, current & resistance.

Limitations of Ohm's Law:

1.Ohm's law is applicable for conductors at constant temperature.

2.It does not apply to non-metallic conductors (e.g. graphite).

3.Ohm's law does not apply to nonlinear devices (e.g. Zener diode)