A-level Physics · Resistivity

Resistivity of a wire

Use R = ρL/A with the area found from a diameter in mm, to find R, ρ or the length.

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Question 1

A uniform constantan wire of length 3.1 m has a diameter of 0.25 mm. The resistivity of constantan is 4.9×10−74.9 \times 10^{-7} Ω m. Calculate the resistance of the wire. Give your answer to 3 significant figures.

Ω

You can type 4.53, 3.2e-5, 3.2 × 10^-5 or 7/3.

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