Question

Write the factors affecting resistance of a conducting wire. Derive the s.I. Unit of electrical resistivity. Define the electrical conductivity.​

Answer 1

Answer:

Electrical conductivity:

Electrical conductivity may be defined as the reciprocal of resistivity. R directly proportional to the resistivity of the wire. R directly proportional to the length of the wire. R inversely proportional to the cross-sectional area of the wire

Answer 2

Explanation:

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♡ ↪The resistance of a conductor depends on thickness (cross sectional area of the wire), length and temperature.

Resistivity is defined as the measure of the resisting power of a specified material to the flow of an electric current.

R=ρ l/A

where R = Resistance of the conductor

ρ = Resistivity of the conductor

l = length of the conductor

A = Area of cross section

i.e., ρ=R | / A

Unit of resistivity is Ωm.

♡

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