What is meant by resistance of a conductor? Name and define its SI unit. List the factors on which the resistance of a conductor depends. How is the resistance of a wire affected if: (i) its length is doubled, .(ii) its radius is doubled?
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Resistance is defined as the property of a conductor to resist the flow of charges through it. The resistance of conductor is numerically given as the ratio of potential difference across its length to the current flowing through it.
shreyaarora1:
SI unit of Resistance is Ohm
Resistance depends on following factors:
1) Length: It is directly proportional to resistance of the conductor.
2) Area: It is inversely proportional to resistance to the cross sectional area of the conductor.
3) Temperature: It is directly proportional to resistance.
4) Resistivity: It is directly proportional to resistance of the conductor.
Formula showing relation of resistance with these factors.
R = (p*l)/A
where, R = resistance; p = Resistivity; l = length; A = area
1) Length: It is directly proportional to resistance of the conductor.
2) Area: It is inversely proportional to resistance to the cross sectional area of the conductor.
3) Temperature: It is directly proportional to resistance.
4) Resistivity: It is directly proportional to resistance of the conductor.
Formula showing relation of resistance with these factors.
R = (p*l)/A
where, R = resistance; p = Resistivity; l = length; A = area
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