Question

physics:
difference between resistance and resistivity?please help​

Answer 1

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Answer 2

Answer:

Resistance

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

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

3) Symbol R

4) Formula R = V/I or,

R = ρ(L/A)V = Voltage, I = Current, ρ = Resistivity ρ = (R×A)/L

 

5) SI Units The SI unit of resistance is Ohms

6) Applications The property of resistance is used in several places like heaters, fuses, sensors, etc.

Resistivity

1) Definition  Resistivity is the physical property of a particular substance which is having particular dimensions.

2) Proportionality  Resistivity is only proportional to the nature and temperature of the particular material.

3) Symbol ρ

4) Formula

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

5) SI Units The SI unit of resistance is Ohms .

6) Applications Electrical resistivity measurement is used as a quality control test for calcareous soil.

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