A student records the following potential difference–current readings for a metallic…

PHYSICS · Multi-part · A Level · Physics · Electricity · Electricity

Problem

A student records the following potential difference–current readings for a metallic wire kept in the circuit for a few minutes:   1.0 A  →  2.0 V\;1.0\,\text{A}\;\to\;2.0\,\text{V}   2.0 A  →  4.3 V\;2.0\,\text{A}\;\to\;4.3\,\text{V}   3.0 A  →  7.2 V\;3.0\,\text{A}\;\to\;7.2\,\text{V} (a) Using these data, comment on whether the resistance of the wire remains constant over the given range. (b) Give the most likely cause for any change in resistance that you infer.

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