If the material has negative temperature coefficient, the resistance ______ with increase in temperature. 

Temperature coefficient of resistance

• The temperature coefficient of resistance is the change in electrical resistance of a substance with respect to per degree change in temperature.
• A positive coefficient for a material means that its resistance increases with an increase in temperature.
• Pure metals typically have positive temperature coefficients of resistance.
• A negative coefficient for a material means that its resistance decreases with an increase in temperature.
• Semiconductor materials (carbon, silicon, germanium) typically have negative temperature coefficients of resistance.