a) The resistance of a conductor is 1 ohm. What is meant by this statement?
b) What is the resistance of a 100 m length of copper wire having a radius of 0.3mm
(resistivity of copper = 1.68x10 12m)?
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Answer:
Length = 2KM = 2x 10^3 M
Dia = 0.5 mm >= 0.5/1000 = 0.0005 m
Area = Pi*d^2/4 = 7.85x 10^ ^-7 Sq Mtr/4
Resistivity = 1.7 x10^-6 ohm meter
R = Resistivity x length / area
= 1.7x10^-6 x 2 x 10^3 /7.85 x 10 ^-7/4
= 1.7 x 2/7.85 x 10^4 = 0.433 x 10 ^ 4 = 4330 Ohms = 4.33 K Ohms/4 = 1.08K
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