When the temperature of a conductor is raised, its resistance
Correct answer: B. Always increase
- A. Remains the same
- B. Always increase
- C. Always decrease
- D. None of these
Explanation
When the temperature of a conductor is raised, its resistance typically increases. This phenomenon is known as the positive temperature coefficient of resistance. It occurs because an increase in temperature leads to increased thermal vibrations of the atoms within the conductor's lattice structure. These vibrations impede the flow of electrons, resulting in higher resistance to the flow of electric current.
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About Current Electricity
Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
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