a) conductors

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10 Terms

1
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  • define number density

  • the number of free electrons per volume in a material

2
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  • state the formula for number density

  • number density (m^-3) = number of free electrons / volume (m^3)

3
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  • state how number density affects conductivity

  • greater number density = stronger conductivity

4
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  • state the overall electrical conductivity of an insulator

  • weak electrical conductivity

5
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  • state the number density of an insulator

  • close to zero

6
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  • state the overall conductivity of a semiconductor

  • moderate electrical conductivity

7
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  • state the number density of a semiconductor

  • around 10^18m^-3

8
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  • state the overall conductivity of a conductor

  • strong electrical conductivity

9
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  • state the number density of a conductor

  • around 10^28m^-3

10
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  • explain how to increase the conductivity of a conductor

  • the electrons would have to move faster

    • by increasing the potential difference

    • by decreasing the resistance