Factors affecting the resistance of a conductor | Class 9 physics

Factor affecting resistance

(i) The material of wire: The resistance of wires of the same length, same area of cross-section, but of different materials differ depending on their material. Metals have low resistance.

(ii) The length of wire: The resistance of a wire is directly proportional to the length of the wire. A long wire offers more resistance than a short wire.

(iii) The area of cross-section of wire: The resistance of a wire is inversely proportional to the length of the wire. A thick wire offers less resistance than a thin wire.

(iv) The temperature of the wire: The resistance of a wire increases with the increase in its temperature.

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