What is the difference between resistance and resistivity?
Answers
Answer:
The resistance is the ratio of the length and cross-section area of the conductor, whereas the resistivity of the material is the ratio of the product of the resistance and area to the length of the conductor.
The resistance is represented by the symbol R whereas the resistivity is represented by the symbol ρ.
Explanation:
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Answer:
Resistance Resistivity
It is the opposition to the flow of electric current through a conductor. It is the resistance of a meter cube of a wire.
Its SI unit is ohm ( Ω ). Its SI unit is ohm-meter (Ω-m).
It depends upon the length and area of the cross-section of the wire. It does not depend upon the length and area of the cross-section of the wire.
Now!
We learn in detail about resistance and resistivity.
Resistance
From the relation of Ohm’s law (V=IR), R is the constant of proportionality and is called the resistance of the conductor. It is defined as: “The opposition to the flow of charge through a conductor is called electrical resistance.
The SI unit of resistance is ohm (Ω ). It is defined as “Resistance is said to be 1 ohm, when one ampere of current passes through the conductor due to the potential difference of one volt across its ends.”It can be expressed as:
R = V/I
Therefore
1 ohm =1 volt/1 ampere
The resistance of a conductor depends upon
Dimensions of the conductor ( length and area of the cross-section).
The physical state of the conductor (temperature etc ).
What is resistivity?
Resistivity can be defined as the resistance of a meter cube of a wire. It is the property of the material of which the wire is made.
It has been observed experimentally that the resistance R of a wire is directly proportional to its length L and inversely proportional to its area of cross-section of the wire.i.e
resistivity formula
If L= 1m and A= 1m² ,then above equation (3) becomes ρ = R.
So resistivity is defined as: ” the resistance of wire whose length is one meter and whose area of cross-section is one-meter square.
SI unit of resistivity is ohm-meter (Ωm).It depends upon the nature of the material and temperature of the material,it is independent of dimensions of the conductor.