Resistivity and Superconductivity

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Three things determine resistance:

  • Length: The longer the wire the more difficult it is for current to flow.
  • Area: The wider the wire the easier it will be for electrons to get through it.
  • Resistivity: (depends on material). The structure may may it easy or difficult for charge to flow. It also depends on environmental factors such as temperature or light intensity.
  • The resistivity of a material is defined as the resistance of 1m length with a 1m² cross-sectional area. It is measured in ohm-metres.
  • ρ=RA/l


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