a) conductors

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4 Terms

1
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  • define number density

  • state the formula for number density

  • state how number density affects conductivity

  • number density = the number of free electrons per volume in a material

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

    • the greater number density, the stronger the conductor

2
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  • state the different types of materials and their overall electrical conductivity

  • state their number density

  • insulator = a weak electrical conductor

    • number density = close to zero

  • semiconductor = a moderate electrical conductor

    • number density = around 10^18m^-3

  • conductor = a strong electrical conductor

    • number density = around 10^28m^-3

3
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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

4
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