Question

Wuite two difference between resistence and resistivity
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Answer 1

Answer:

One of the major difference between the resistance and the resistivity of the material is that the resistance opposes the flow of free electrons whereas the resistivity is the property of the material which defines the resistance of the material having specific dimension.

Explanation:

Resistance Resistivity

1 Definition Resistance is the physical property of a substance because of which it opposes the flow of current i.e. electrons. Resistivity is the physical property of a particular substance which is having particular dimensions.

2 Proportionality Resistance is directly proportional to the length and temperature while it is inversely proportional to the cross-sectional area of the material. Resistivity is only proportional to the nature and temperature of the particular material.

3 Symbol R ρ

4 Formula R = V/I or,

R = ρ(L/A)

V = Voltage, I = Current, ρ = Resistivity

ρ = (R×A)/L

R = Resistance, L= Length, A = Cross-sectional area

5 SI Units The SI unit of resistance is Ohms The SI unit of resistivity is Ohms-meter.

6 Applications The property of resistance is used in several places like heaters, fuses, sensors, etc. Electrical resistivity measurement is used as a quality control test for calcareous soil.