Practice Resistivity (specific Resistance) (8.8)

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6 sample questions

Question 1.
What is the unit of resistivity?
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Think about how resistance is measured.
Question 2.
What does low resistivity indicate about a material?
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Consider the flow of electric current.
3Question 3.
What is the formula for resistance in terms of resistivity?
- R = ρ / (l * A)
- R = ρ * (l / A)
- R = l / A
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Recall the dimensions of the wire.
4Question 4.
True or False: Resistivity depends on the dimensions of the conductor.
- True
- False
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Consider what factors resistivity is determined by.
Question 5.
A cylindrical wire made of material X has a resistivity of 2.5 × 10^-8 Ω·m, with a length of 3 m and a diameter of 2 mm. Calculate its resistance.
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Convert the diameter to radius for area calculation.
Question 6.
Discuss the implications of using a material with high resistivity in home wiring solutions.
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Think about the effects on electricity bills and safety.

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