| Resistance | Resistivity |
| The electrical resistance of an object is a measure of its opposition to the flow of electric current. |
Resistivity
is the characteristic
property of the material by
which it
resists the amount of curren
t through it.
|
|
It depends upon
the
length , area of cross-section and nature of the material of the given material, and physical conditions like temperature |
It only
depends upon
the
nature of the material and physical conditions like temperature. |
| Its SI unit is ohm (Ω) | Its SI unit is ohm meter. (Ω-m) |
| It is denoted by R . | It is denoted by ρ (rho) |
|
Formula
for Resistance is
R = V/I, or R = ρ(L/A) where V = Voltage, I = Current, ρ = Resistivity |
Formula
for Resistivity is
ρ = (R×A)/L where R = Resistance, L= Length, A = Cross-sectional area |
| Resistance depends on dimensions of the material, like length, area of cross-section |
Resistivity is independent of the dimensions of material
|
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