Question

what is ohm's law and the equation for it?

Answer 1

Ohm's law:
The potential difference between the ends of the conductor is directly proportional to the electric current passing through it at constant temperature.
Equation:
R=V/I

Answer 2

Ohm's law states that the current flowing through a conductor between two points is directly proportional to the potential difference between the two points.

Equation :-
Resistance of wire(R)=Potential differnce across the wire(V)/current flowing in                                                                                                        the wire(I)
                               R=V/I or V=I R