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Current Electricity: Carbon vs Metallic Resistors MCQ

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Carbon vs Metallic ResistorsMediumQuestion 31697

Question

Carbon resistors have a negative temperature coefficient (NTC) meaning:
  1. A
    Resistance increases with temperature like metals
  2. B
    Resistance decreases as temperature rises
    Correct
  3. C
    Resistance stays constant
  4. D
    Resistance oscillates

Correct answer

Resistance decreases as temperature rises

Explanation

Carbon/semiconductors have NTC: more carriers excited at higher T → conductivity increases → resistance decreases. Opposite to metals which have positive TC (PTC).

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