explain factors on which resistance of a conductor depends
Answers
Explanation:
Conductor resistance is a property of a conductor at a specific temperature, and it is defined as the amount of opposition there is to the flow of electric current through a conducting medium.[2] The resistance of a conductor depends on the cross sectional area of the conductor, the length of the conductor, and its resistivity. It is important to note that electrical conductivity and resistivity are inversely proportional, meaning that the more conductive something is the less resistive it is.
The resistance of a conductor can be calculated at a temperature of 20°C using:[3]
R=ρLA
where:
R is the resistance, in ohms (Ω)
ρ is the resistivity of the material in ohm meters (Ωm)
L is the length of the conductor in meters (m)
A is the cross-sectional area of the conductor in meters squared (m2)
This formula tells us that the resistance of the conductor is directly proportional to ρ and L, and inversely proportional to A. Since the resistance of some conductor, such as a piece of wire, depends on collisions within the wire itself, the resistance depends on temperature.
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