Question

A complete circuit is left on for several minutes, causing the connecting copper wire to become hot. As the temperature of the wire increases, the electrical resistance of the wire:
[1 Mark]

A. decreases
B. remains the same
C. increases
D. increases for some time and then decreases.

Answer 1

Solution:
Correct option: C, increases [1 Mark]
Effect of temperature on resistance of different material:
Conductor: When the temperature of conducting material increases, the resistance of that
particular material increases.
Insulator: When the temperature of the material increases, the resistance of that particular material
decreases.
Semiconductor: When the temperature of material increases, the resistance of that particular
material decreases.
Copper is a metal conductor which has a positive temperature coefficient which causes an increase in
resistance due to an increase in temperature.
Hence the correct option is to Increase