1.2. Classification of Materials by Conductivity

Try these first

1. 1.

   Name one example of a conductor.

   Hint

   Think of materials used in electrical wiring.

2. 2.

   What is a characteristic of insulators?

   Hint

   Consider materials that prevent electricity from passing.

3. 3.

   What are the primary characteristics of conductors?

   • Very low conductivity
   • Very high conductivity
   • Moderate conductivity

   Hint

   Consider metals commonly used in cables.

4. 4.

   True or False: Insulators have energy band gaps less than 5 eV.

   • True
   • False

   Hint

   Think about the properties of insulators.

5. 5.

   Explain how semiconductor doping alters its conductivity and provide examples of dopants for n-type and p-type semiconductors.

   Hint

   Think about how additional electrons or holes changes conductivity.

6. 6.

   Calculate the percentage increase in conductivity when the temperature of a semiconductor is raised from -20°C to 100°C.

   Hint

   Research how temperature affects semiconductor properties to aid in your calculation.