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Current Electricity
Question
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V-I graph for a metallic wire at two different temperatures T1 and T2 is shown in the figure. Which of the two temperatures is the higher and why?

Answer

The slope of the given graph gives us the inverse of resistance. Resistance of a material increases with increasing temperature because the collision between the molecules increases. 
In the graph given, T2 has a smaller slope and hence corresponds to higher resistance. Therefore, T2 > T1.

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What conclusion can you draw from the following observations on a resistor made of alloy manganin?

Current A

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Voltage V

0.2

0.4

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