define resistance of a conductor state the factors on which resistance of a conductor depends name the device which is often used to change the resistance without changing the voltage source in an electric circuit calculate the resistance of 50 cm length of wire of cross sectional area 0.01 square mm and of resistivity 5×10 -8 m
Answers
Answer:
The resistance of a conductor depends on thickness (cross sectional area of the wire), length and temperature.
Resistivity is defined as the measure of the resisting power of a specified material to the flow of an electric current.
R=ρ
A
l
where R = Resistance of the conductor
ρ = Resistivity of the conductor
l = length of the conductor
A = Area of cross section
i.e., ρ=R
l
A
Unit of resistivity is Ωm.
Answer:
The resistance of a conductor depends on thickness (cross sectional area of the wire), length and temperature.
Resistivity is defined as the measure of the resisting power of a specified material to the flow of an electric current.
R=ρ
A
l
where R = Resistance of the conductor
ρ = Resistivity of the conductor
l = length of the conductor
A = Area of cross section
i.e., ρ=R
l
A
Unit of resistivity is Ωm.