Question

define Resistivity and state SI unit does it its value with temperature​

Answer 1

Heya!!

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Resistivity is the property of a material through which it opposes the flow of current.

→ SI unit is rho

→ where,

R = rho L/A

rho = RA/L

→ For metals ... resistivity increases with increase in temperature

→ for semiconductors... it's value decreases with increase in temperature.

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Answer 2

Explanation:

(i) The resistance of a given conductor is directly proportional to its length.That is :

R proportional to L....(¡)

(ii) The resistance of a given conductor is inversely proportional to its area of cross-section,That is :

R inversely proportional to 1/A.......(¡¡)

By combining the relations (¡) and (¡¡),we get :

R is inversely proportional to L/A

R=p×L/A.....(¡¡¡)

where p(rho) is a constant known as resistivity of the material of the conductor. Resistivity is also known as specific resistance.

From equation (¡¡¡),it is clear that for a given conductor having a specified length L and area of cross-section A,the resistance R is directly proportional to its resistivity P.So, if we change the material of a conductor to one whose resistivity is two times , then the resistance will also become two times, then the resistance will also become two times.And if we change the material of a conductor to one whose resistivity is three times, then the resistance will also become three times.

If we arrange equation(¡¡¡),we can write it as :

Resistivity, P=R×A/L

where R = Resistance

A= Area of cross - section

and L= Length of the conductor

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