Question

State and prove ohms law by graphical method

Answer 1

OHM's LAW:
Current flowing through a conductor is directly proportional to the potential difference across the ends of the conductor provided physical conditions like temperature remains constant.
OR
So long as the physical state of the conductor remains the same, the potential difference applied between the two ends of the conductor, bears a constant ratio to the electric current passing through it.

V is directly proportional to I
or V/I= constant
V/I=R
or V=RI
where R is the resistance of the conductor.

Answer 2

according to. ohms lam at constant temperature and pressure, current is directly proportional to potential difference between wires.
that is
I is directly proportional to v
v is directly proportional to i
v=ir