Question

what is ohm law ? explain how it is used to define the unit of resitance?

Answer 1

Hola friend!!
Rajdeep here....

According to Ohm's Law,
The flow of current is directly proportional to the potential difference applied at its ends provided that temperature and physical conditions are constant.

So V is directly proportional to I
or V = IR
Where R is constant of proportionality, which is called resistance.
Unit of V is Volt(V) and that of Current is Ampere(A).

Hence from relation V = IR,
R = V/I
So unit of R is V/A, which is called Ohm.

Thanks!

Answer 2

according to the ohms law : at a constant temperature the current flowing through a conductor is directly proportional to the potential difference