Login

 diference between resistance &

resistivity?

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.

Example:

We say resistance of the 1 meter long copper wire used in the circuit is 0.5 Ω, total resistance of the circuit is 1000 Ω.

Resistivity of copper is 1.7 × 10 -8 Ω m at room temperature. There is nothing called resistivity of a circuit.

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

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.

  • 30
View Full Answer

Well.. In a very simple language for better understanding..

RSISTANCE is the property of a conductor to oppose the flow of current .

While

RSISTIVITY is the POWER TO RESIST . 

Resistance can change with respect to the current (V=IR, HENCE R=V/I)   .. BUT .. Resistivity remains the same for a particular conductor as they have a certain power to oppose th current.

For exapmle-there are 2 boys Fat(healthy) and Thin(weak).If they enter in a crowd in opposite direction,they both have the property to oppose the crowd(which is the resistence here) but the resistivity i.e their POWER TO OPPOSE remains constant as thin boy cannot apply force more than his ability and same with the fat one.

PLZ GIVE THUMBS UP IF U COME TO UNDERSTAND THE ANSWER

  • 20

 resistence - it is the property of a conductor which opposes or restricts th flow of current through it . it is measured in ohms.

the symbol of ohm is omega.

accoding to ohm's law

R=V/I

1 ohm = 1volt / 1 ampere

resistivity - the resistivity of the material is defined as the resistance offered by amettalic wire having a unit length and a unit area of cross-section.

resistivity =R*A / l

  • 6
What are you looking for?