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Most metallic conductors have a ________.
- a)neutral temperature coefficient of resistance
- b)negative temperature coefficient of resistance
- c)positive temperature coefficient of resistance
- d)zero temperature coefficient of resistance
Correct answer is option 'C'. Can you explain this answer?
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Most metallic conductors have a ________.a)neutral temperature coeffi...
In general metallic conductors have a positive temperature coefficient of resistance. The resistance increases with an increase in temperature.
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Most metallic conductors have a ________.a)neutral temperature coeffi...
Explanation of the Answer
The correct answer to the given question is option 'C' - positive temperature coefficient of resistance.
Overview of Temperature Coefficient of Resistance
In order to understand why most metallic conductors have a positive temperature coefficient of resistance, it is important to first understand what temperature coefficient of resistance (TCR) means.
The temperature coefficient of resistance is a measure of how the resistance of a material changes with a change in temperature. It indicates whether the resistance of a conductor increases or decreases when the temperature changes.
Explanation
Most metallic conductors have a positive temperature coefficient of resistance, which means that their resistance increases with an increase in temperature. This can be explained by considering the behavior of the electrons in a metallic conductor.
- Collisions: In a metallic conductor, the flow of electric current is primarily due to the movement of free electrons. These free electrons constantly collide with atoms and other free electrons as they move through the conductor. These collisions result in the scattering of electrons, which creates resistance and hinders the flow of current.
- Increased Vibrations: When the temperature of the conductor increases, the atoms in the conductor vibrate with higher energy. These increased vibrations make it more difficult for the free electrons to move through the conductor without colliding. As a result, there is an increase in the number of collisions between the free electrons and the vibrating atoms, leading to an increase in resistance.
- Reduced Mean Free Path: The mean free path of the free electrons, which is the average distance they can travel before colliding, decreases with an increase in temperature. This reduced mean free path further contributes to an increase in resistance.
Due to these factors, the resistance of metallic conductors generally increases with temperature, resulting in a positive temperature coefficient of resistance.
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Most metallic conductors have a ________.a)neutral temperature coefficient of resistanceb)negative temperature coefficient of resistancec)positive temperature coefficient of resistanced)zero temperature coefficient of resistanceCorrect answer is option 'C'. Can you explain this answer?
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