Exam-style question
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What is the formula used to calculate the resistivity of a wire?.
- A.R = rho L / A
- B.R = V / I
- C.R = P / I^2
- D.R = V^2 / P
Model answer
What a good answer should say
- R = rho L / A
Explanation
Why this works
The formula R = rho L / A defines resistivity, where R is resistance, rho is resistivity, L is the length of the wire, and A is the cross-sectional area. This relationship is fundamental in understanding how materials resist electrical flow.
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