Give the relation for resistance.
Answers
Answer:
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=ρ
A
l
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.
Answer:
R=V/I
Explanation:
V=IR.
so
R:V/I
also
R=(rho*l)/a, where rho is specific resistance of material, l is length of wire and a is area of cross section of wire