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 m
length of wire of cross sectional area 0.01 square mm and of resistivity × − .
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The resistance of a conductor depends on the cross sectional area of the conductor, the length of the conductor, and its resistivity. Potentiometer are used often to change the resistance without changing the voltage source in an electric circuit.
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Resistance is the ability of an element to oppose the flow of electric current.
Resistance depends on the following factors:-
Resistance is directly proportional to the length of the element. Resistance is inversely proportional to the Area of the cross section of the wire.
It also depends on resistivity of the element.
The device which is often used to change the resistance without changing the voltage source in an electric circuit is rheostat.
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