Materials that _____ their resistance with an increase in temperature have a positive coefficient of temperature.

Materials that _____ their resistance with an increase in temperature have a positive coefficient of temperature.

• A. Increase
• B. Decrease
• C. Remain
• D. Oscillate

Answer: (A)

Temperature coefficient of resistance describes how resistance changes as temperature changes. If a material has a positive coefficient, its resistance increases when temperature rises. This relationship is often written as R ≈ R0[1 + α(T − T0)], where a positive α means R grows with T. So materials that increase their resistance with increasing temperature have a positive temperature coefficient. The other options would imply different behavior: decreasing resistance would mean a negative coefficient, remaining constant would mean a zero coefficient, and oscillating doesn’t describe a steady, sign-defined change with temperature.

Temperature coefficient of resistance describes how resistance changes as temperature changes. If a material has a positive coefficient, its resistance increases when temperature rises. This relationship is often written as R ≈ R0[1 + α(T − T0)], where a positive α means R grows with T. So materials that increase their resistance with increasing temperature have a positive temperature coefficient. The other options would imply different behavior: decreasing resistance would mean a negative coefficient, remaining constant would mean a zero coefficient, and oscillating doesn’t describe a steady, sign-defined change with temperature.