Question

state and explain ohms law and how can ohms law be verified experimentaly​

Answer 1

Verification of Ohm's Law

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 ∝ I (or) 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 & Iand 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

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According to Ohm's law,

• Current flowing in a conductor is directly proportional to the potential difference applied across to its ends at constant temperature & physical conditions.

So, According to the definition

V ∝ I

V/I = constant

• Put the constant as “r” which indicates the resistance of the conductor.

R = V/I

V = IR

Where

• I = current flowing in the conductor
• V = potential difference applied across the conductor
• R = resistance of the conductor

• Unit of Resistance is called omega (Ω)