Question

give the statements of Ohm's law and how this law is verified

Answer 1

Objective:

To verify the Ohm's law.

Statement of Ohm's Law:

Ohm’s law states that at a constant temperature, current 'I' through a conductor between two points is directly proportional to the potential difference or voltage 'V', across the two points. That is,

V propto I

or frac{V}{I} = constant = R

or V = IR

Thus, the ratio V : I is a constant. This constant is called as the resistance (R) of the conductor.

Graph:

After performing experiment for different readings of V & I and recording the observations, if we plot current on the x-axis of a graph and voltage on the y-axis of the graph, we will get a straight-line. The gradient of the straight-line graph is related to the resistance (R) of the conductor.

Answer 2

the electric current passing through the conductor is directly proportional to the voltage applied across it ends providing the physical condition remain unchanged.
let us take any conductor and apply different values of potential difference across it for each potential measure the different values of current plot the graph of v i if graph is straight line then Ohm's law is verified.