explain Ohms law??

Imagine a set of experiments, with different batteries, differents wires of different diameter, length and metals.

 

Now by connecting a battery say 12V across a particular wire, we measure the current. We do this for different wires and batteries and record into a table the V's and I's. 

 

Now Ohm's law says that if we do this at constant temperature, the ratio V/I is constant for the particular combination, i.e. the electric current is directly propotional to the voltage or potential different. And the constant is called the resistance of the wire.

 

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TopperLearning.