What is resistance and resitivity?

Dear Student,

Resistance is a 
measure of the opposition that a circuit (or an electrical element) offers to the flow of electric current . Resistance is dependent on the length and area of cross-section of the conductor. It is measured in Ohms, Ω . Resistance of a conductor changes with temperature.

Resistivity is the measure of a material’s ability to oppose the flow of current . Resistivity of a conductor is a property of the material of the conductor. Unit of resistivity is Ohm meter, Ω m . Resistivity of the material of the conductor changes with temperature.

 

Following is the equation relating resistivity (ρ) and resistance (R) of a conductor of length (L) and area (A).

R=ρLA

Differences:

Resistivity

Resistance

1. It is the measure of a material’s ability to oppose the flow of current.

1. It is a measure of the opposition that a circuit (or an electrical element) offers to the flow of electric current.

2. It depends on the property of the material. Its value is constant for a particular range of temperature.

2. Resistance of a conductor is directly proportional to its length and inversely proportional to its area of cross-section.

3. Unit of resistivity is Ohm meter, Ω m.

3. Unit of resistance is Ohm, Ω.

Regards

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Hii...

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Resistance is the obstruction to the flow of current..
Depends on length and area of cross section..
However resistivity is a constant value which depends upon the material..
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Resistance is a property of condutcer
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Resistance is a?measure of the opposition?that a circuit (or an electrical element) offers to the flow of electric current
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