For a certain metallic wire

PHYSICS · Subjective · A Level · Physics · Electricity · Electricity

Problem

For a certain metallic wire, the following readings were recorded: At 25∘C25^{\circ}\text{C}: V=10 VV = 10\,\text{V}, I=2.0 AI = 2.0\,\text{A} At 200∘C200^{\circ}\text{C}: V=10 VV = 10\,\text{V}, I=1.6 AI = 1.6\,\text{A} (a) Calculate the resistance of the wire at each temperature. (b) Does the wire obey Ohm’s law over this temperature range? Justify your answer in one sentence.

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