Ohm's law applies to electric conduction through conductors and may be stated as follows:-

**‘The ratio of potential difference (V) between any two points on a conductor to the current (I) flowing between them, is constant, provided the temperature of the conductor does not change.’**
In other words V/I = constant

or V /I = R

Where R is the resistance of the conductor between the two points considered

Put in another way, it simply means that provided R is kept constant, current is directly proportional to potential difference across the ends of the conductor.

For a constant value of *R*, if the
value of *V* is increased, the value of *I* increases;
if *V* is decreased, then *I* decreases. Also notice that if *V*
is constant and *R* is increased, *I* decreases. Similarly, if *V* is constant and
*R* is decreased, *I* increases.
Figure show the current voltage relationship for R=10 ohm.

Material that obeys Ohm's Law is called '**ohmic' **or '**linear' ** because the potential difference across it varies linearly with the current. However this linear relationship between V and I does not apply to all non-metallic conductors.

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