General Science • PhysicsMedium
What happens to the electrical resistance of a pure metallic conductor when its temperature is increased?
A. It decreases linearly
B. It remains constant
C. It increases✓ Correct Answer
D. It drops to zero
💡 Solution & Explanation
The electrical resistance of pure metals increases with rising temperature because thermal agitation causes metal ions to vibrate more vigorously, which increases the frequency of collisions with free electrons and hinders their drift velocity. Semiconductors and electrolytes exhibit the opposite behavior where resistance decreases with temperature. Platinum resistance thermometers exploit this precise temperature coefficient of resistance.
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