Exam-style question
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What is the formula for calculating resistance in terms of resistivity, length, and cross-sectional area?.
- A.R = rho L / A
- B.R = A / (rho L)
- C.R = L / (rho A)
- D.R = rho A / L
Model answer
What a good answer should say
- R = rho L / A
Explanation
Why this works
The correct formula for resistance (R) is R = rho L / A, where rho is the resistivity, L is the length of the conductor, and A is the cross-sectional area. This relationship shows how resistance depends on the material properties and dimensions of the conductor.
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