Physics 2011 JAMB Past Questions - Question 49: which of the following materials has an increase in resistance with temperature ?

Correct Answer

D

Explanation

The materials that exhibit an increase in electrical resistance with an increase in temperature are known as "resistive" or "positive temperature coefficient" (PTC) materials. The most common example of such a material is:

1. **Pure Metals:** Most pure metals, like copper, aluminum, and gold, exhibit an increase in electrical resistance as their temperature rises. This is described by the positive temperature coefficient of resistance (PTC) for these materials.

On the other hand, there are materials with a negative temperature coefficient (NTC) of resistance, which means their electrical resistance decreases as temperature increases. An example of such a material is:

2. **Semiconductors:** Semiconductors, like silicon and germanium, typically exhibit a decrease in resistance as their temperature rises, which is known as a negative temperature coefficient (NTC) of resistance.

So, if you're looking for a material with an increase in resistance with temperature, you should consider pure metals.