resistivity

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6 Terms

1
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what is resistivity

the property of a material related to its resistance. It is equivalent to the resistance in 1m of a wire of a certain material with cross-sectional area of 1 m2.

2
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resistivity equation & explination

  • R=ρL / A​

  • Where R is the resistance, A is the cross-sectional area of the wire and L is its length.

3
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four factors which can affect the resistance of a wire

  1. Temperature

  2. Length

  3. Cross-sectional area

  4. Material

4
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when ρ and A are constant, what would happen to R if you doubled L

R would also double as they are directly proportional

5
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When ρ and L are constant, R and ρ are

inversely proportional; doubling A will halve R.

6
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A=πd2/ 4

doubling d will increase the area by a factor by 4. Therefore, R will decrease by a factor of 4.