b) Influences on resistance

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8 Terms

1
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  • the four factors that influence the resistance of a wire


  • the material of the wire

  • the temperature of the wire

  • the length of the wire

  • the cross-sectional area of the wire


2
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  • the material of a wire influences its resistance because…


  • different materials have different resistivities


3
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  • the relationship between the temperature and the resistance of a wire


  • directly proportional


4
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  • a high temperature in a wire causes a high resistance because…


  • positive ions and electrons have more kinetic energy

  • larger vibrations

  • more collisions


5
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  • the relationship between the length and the resistance of a wire


  • directly proportional


6
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  • a longer length of wire causes a high resistance because…


  • there are more positive ions

  • there are more collisions with electrons


7
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  • the relationship between the cross-sectional area and the resistance of a wire


  • inversely proportional


8
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  • a larger cross-sectional area of a wire causes a low resistance


  • more pathways for electrons to travel through