Q44
General SciencePhysics
The positive temperature coefficient of resistance is for
- a.Carbon
- b.Germanium
- c.Copper
- d.An electrolyte
Answer: (C) Copper
In a metal such as copper, resistance rises with temperature because the vibrating lattice scatters electrons more, giving a positive temperature coefficient. Carbon and the semiconductor germanium have negative coefficients, and electrolytes conduct better when warmed.