Derivation of resistivity
Given: R = ρl/a
Where, R – Resistance,
ρ – Resistivity
l – length of material
A – Area of cross-section
Rearranging the above equation,
RA = ρl
ρl = RA
ρ = (RA)/l
Resistivity Formula
When a potential difference is applied across an object (conductor), the electrons start moving, which produces a current in the object. During this movement of electrons, they collide with other electrons too, which causes some opposition to the flow of electrons, this phenomenon of opposing the flow of electrons is known as Resistance(R). Its SI unit is the ohm(Ω)
Table of Content
- Factors affecting the resistance
- Resistivity Formula
- Derivation of resistivity
- SI unit of resistivity
- Factors affecting the resistivity
- Sample problems