9
Question
Define resistance and resistivity. Give the relation between them. Explain the dependence of resistance on temperature.
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Solution
The measure of a material's ability to oppose the flow of electric current through it is called resistance and it is denoted by R.
Resistivity is defined as the resistance of a material of unit length and unit cross section area. It is denoted by ρ. It is a fundamental property of a material and tells how strongly the material is opposing the current.
The resistance is related to resistivity by the relation,
R=ρlA
The resistivity of a material depends on temperature. It increases with the increase in temperature and decreases with the decrease in temperature.
Thus, the resistance of a material also increases or decreases with the increase and decrease in temperature.
The measure of a material's ability to oppose the flow of electric current through it is called resistance and it is denoted by R.
Resistivity is defined as the resistance of a material of unit length and unit cross section area. It is denoted by ρ. It is a fundamental property of a material and tells how strongly the material is opposing the current.
The resistance is related to resistivity by the relation,
R=ρlA
The resistivity of a material depends on temperature. It increases with the increase in temperature and decreases with the decrease in temperature.
Thus, the resistance of a material also increases or decreases with the increase and decrease in temperature.
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