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Question

On what factors does the resistance of a conductor depends?


Solution

The resistance of a conductor first depends on the material from which it is made. The resistance is nothing but opposition in the path of the free electrons of a conductor. This opposition in conductor varies from material to material. Then there are others that contribute to the resistance of a conductor. They are :
  • Temperature: The temperature is a vital factor in determining the resistance of a conductor. More the temperature, more the movement of free particle resulting in more collisions. Thus with the temperature increase, resistance also increases due to the increased number of collisions.
  • Area of cross-section and length: More the area of cross-section, the resistance is less. That is the area of a section is inversely proportional to resistance. On the other hand, resistance is directly proportional to the length of the conductor. The more the length, more is the resistance.


Physics

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