Question

What is resistance? What are the factors on which resistance depends?

Answer 1

Resistance is the opposition that a substance offers to the flow of electric current. It is represented by the uppercase letter R. The standard unit of resistance is the ohm.
The electrical resistance of a conductor is dependent on the following factors:
- Cross-sectional area of the conductor
- Length of the conductor
- Material of the conductor
- Temperature of the conducting material
Electrical resistance is directly proportional to length (L) of the conductor and inversely proportional to the cross-sectional area (A). It is given by the following relation.
$R=\frac{\rho L}{A}$.
Where $\rho$ is the resistivity of the material.