Distinguish b/w resistance and relativity
Answers
Answer:
One of the major difference between the resistance and the resistivity of the material is that the resistance opposes the flow of free electrons whereas the resistivity is the property of the material which defines the resistance of the material having specific dimension.
WHEREAS,
The resistance is the property of the material which creates an obstruction in the flow of the current. When the voltage is applied across the conductor, the free electrons starts moving in a particular direction. While moving these electrons collapse with atoms or molecules and hence produce heat. These atoms or molecules oppose the movement of free electrons in a material.
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Resistivity The resistivity of a material is the resistance of a wire of that material of unit length and unit cross-sectional area.
The unit for resistivity is the ohm-metre.
The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size.
A good conductor has less resistivity, whereas a bad conductor or insulator has high resistivity.
The resistivity of semi-conductors lies between that of conductors and insulators.
The resistivity of a metallic conductor increases with an increase in its temperature, whereas the resistivity of a semi-conductor decreases with an increase in its temperature.
The resistance of some materials decreases tremendously with a decrease in temperature in the very low temperature range of the order of absolute zero.
Such substances are called superconductors.
Conductivity is the reciprocal of resistivity, and determines the ability of a material to conduct electric current.