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RESISTANCE

Opposition offered by the material of conductor in the flow of electric current is called resistance.
Resistance opposes the flow of current through a conductor. Resistance of a conductor is due to the collision of free electrons with the atoms of the conductor.

It is denoted by “R”

FACTORS ON WHICH RESISTANCE DEPENDS

Length of conductor

Resistance of a conductor is directly proportional to the length of conductor .

R a L…………….(a)

Area of cross section of conductor

Resistance of a conductor is inversely proportional to area of cross section of conductor.

R a 1 / A……………….(b)

Combining (a) and (b)

R a L / A

OR

R = r L / A

Where
r = Resistivity of material of conductor

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